diff --git a/half-earth/nodes/game.tscn b/half-earth/nodes/game.tscn
index 261aa83..6fb6de1 100644
--- a/half-earth/nodes/game.tscn
+++ b/half-earth/nodes/game.tscn
@@ -1,4 +1,4 @@
-[gd_scene load_steps=11 format=2]
+[gd_scene load_steps=10 format=2]
 
 [ext_resource path="res://nodes/grid.tscn" type="PackedScene" id=1]
 [ext_resource path="res://nodes/grid_cursor.tscn" type="PackedScene" id=2]
@@ -7,8 +7,7 @@
 [ext_resource path="res://nodes/interaction_modes/interaction_mode.tscn" type="PackedScene" id=5]
 [ext_resource path="res://nodes/ui/build_mode_ui.tscn" type="PackedScene" id=6]
 [ext_resource path="res://nodes/interaction_modes/build_mode.tscn" type="PackedScene" id=7]
-[ext_resource path="res://nodes/interaction_modes/selection_mode.tscn" type="PackedScene" id=8]
-[ext_resource path="res://nodes/ui/selection_mode_ui.tscn" type="PackedScene" id=9]
+[ext_resource path="res://nodes/ui/mode_selection_ui.tscn" type="PackedScene" id=9]
 
 [sub_resource type="Curve" id=1]
 _data = [ Vector2( 0, 0 ), 0.0, 5.0, 0, 0, Vector2( 0.5, 1 ), 0.0, 0.0, 0, 0, Vector2( 1, 0 ), -4.0, 0.0, 0, 0 ]
@@ -25,14 +24,12 @@ DiffusionCoefficient = 0.1
 Grid = NodePath("../Grid")
 _pulseShape = SubResource( 1 )
 
-[node name="Interaction Mode" parent="." instance=ExtResource( 5 )]
-_buildModePath = NodePath("../Build Mode")
-_selectionModePath = NodePath("../Selection Mode")
+[node name="Interaction Modes" parent="." instance=ExtResource( 5 )]
+_buildModePath = NodePath("Build Mode")
 
-[node name="Build Mode" parent="." instance=ExtResource( 7 )]
-_key = 66
-
-[node name="Selection Mode" parent="." instance=ExtResource( 8 )]
+[node name="Build Mode" parent="Interaction Modes" instance=ExtResource( 7 )]
+_gridPath = NodePath("../../Grid")
+_cursorPath = NodePath("../../Cursor")
 
 [node name="UI" type="Control" parent="."]
 anchor_right = 1.0
@@ -42,20 +39,18 @@ mouse_filter = 2
 [node name="Debug" parent="UI" instance=ExtResource( 3 )]
 
 [node name="Build Mode" parent="UI" instance=ExtResource( 6 )]
-visible = false
-_buildModePath = NodePath("../../Build Mode")
+_buildModePath = NodePath("../../Interaction Modes/Build Mode")
 
-[node name="Selection Mode" parent="UI" instance=ExtResource( 9 )]
-_selectionModePath = NodePath("../../Selection Mode")
+[node name="Mode Selection" parent="UI" instance=ExtResource( 9 )]
 
 [connection signal="OnPauseChanged" from="Clock" to="UI/Debug" method="_on_Clock_OnPauseChanged"]
 [connection signal="OnTick" from="Clock" to="Grid" method="_on_Clock_OnTick"]
 [connection signal="OnTick" from="Clock" to="UI/Debug" method="_on_Clock_OnTick"]
-[connection signal="OnInteractionModeChanged" from="Interaction Mode" to="Cursor" method="_on_Interaction_Mode_OnInteractionModeChanged"]
-[connection signal="OnInteractionModeChanged" from="Interaction Mode" to="UI/Debug" method="_on_Interaction_Mode_OnInteractionModeChanged"]
-[connection signal="OnModeEntered" from="Build Mode" to="Interaction Mode" method="_on_Build_Mode_OnModeEntered"]
-[connection signal="OnModeExited" from="Build Mode" to="Interaction Mode" method="_on_Build_Mode_OnModeExited"]
-[connection signal="OnModeEntered" from="Selection Mode" to="Interaction Mode" method="_on_Selection_Mode_OnModeEntered"]
-[connection signal="OnModeExited" from="Selection Mode" to="Interaction Mode" method="_on_Selection_Mode_OnModeExited"]
-[connection signal="OnExit" from="UI/Build Mode" to="Interaction Mode" method="Reset"]
-[connection signal="EnableBuildMode" from="UI/Selection Mode" to="Build Mode" method="Enable"]
+[connection signal="OnInteractionModeChanged" from="Interaction Modes" to="Cursor" method="_on_Interaction_Mode_OnInteractionModeChanged"]
+[connection signal="OnInteractionModeChanged" from="Interaction Modes" to="UI/Debug" method="_on_Interaction_Mode_OnInteractionModeChanged"]
+[connection signal="OnModeEntered" from="Interaction Modes/Build Mode" to="Interaction Modes" method="_on_Build_Mode_OnModeEntered"]
+[connection signal="OnModeEntered" from="Interaction Modes/Build Mode" to="UI/Mode Selection" method="EnableBuildMode"]
+[connection signal="OnModeExited" from="Interaction Modes/Build Mode" to="Interaction Modes" method="_on_Build_Mode_OnModeExited"]
+[connection signal="OnExit" from="UI/Build Mode" to="Interaction Modes" method="Reset"]
+[connection signal="OnExit" from="UI/Build Mode" to="UI/Mode Selection" method="Enable"]
+[connection signal="BuildModeEnabled" from="UI/Mode Selection" to="Interaction Modes/Build Mode" method="Enable"]
diff --git a/half-earth/nodes/interaction_modes/build_mode.tscn b/half-earth/nodes/interaction_modes/build_mode.tscn
index aafbfe7..4c2ca0e 100644
--- a/half-earth/nodes/interaction_modes/build_mode.tscn
+++ b/half-earth/nodes/interaction_modes/build_mode.tscn
@@ -1,6 +1,9 @@
-[gd_scene load_steps=2 format=2]
+[gd_scene load_steps=3 format=2]
 
 [ext_resource path="res://scripts/interaction_modes/BuildMode.cs" type="Script" id=1]
+[ext_resource path="res://resources/tile_types/tile_type_collections/buildable_tiles.tres" type="Resource" id=2]
 
 [node name="Build Mode" type="Node"]
 script = ExtResource( 1 )
+_key = 66
+_buildableTilesResource = ExtResource( 2 )
diff --git a/half-earth/nodes/interaction_modes/selection_mode.tscn b/half-earth/nodes/interaction_modes/selection_mode.tscn
index bcc4fc8..4e80ec9 100644
--- a/half-earth/nodes/interaction_modes/selection_mode.tscn
+++ b/half-earth/nodes/interaction_modes/selection_mode.tscn
@@ -1,7 +1,3 @@
-[gd_scene load_steps=2 format=2]
-
-[ext_resource path="res://scripts/interaction_modes/SelectionMode.cs" type="Script" id=1]
+[gd_scene format=2]
 
 [node name="Selection Mode" type="Node"]
-script = ExtResource( 1 )
-_key = 16777217
diff --git a/half-earth/nodes/ui/build_mode_ui.tscn b/half-earth/nodes/ui/build_mode_ui.tscn
index 7b13ee8..2350c06 100644
--- a/half-earth/nodes/ui/build_mode_ui.tscn
+++ b/half-earth/nodes/ui/build_mode_ui.tscn
@@ -3,24 +3,16 @@
 [ext_resource path="res://scripts/ui/BuildModeUI.cs" type="Script" id=1]
 
 [node name="Build Mode" type="Control"]
-anchor_top = 1.0
+anchor_right = 1.0
 anchor_bottom = 1.0
-margin_top = -600.0
-margin_bottom = -600.0
 script = ExtResource( 1 )
 
 [node name="Exit" type="Button" parent="."]
-margin_left = 2.0
-margin_top = 562.0
-margin_right = 38.0
-margin_bottom = 598.0
+anchor_top = 1.0
+anchor_bottom = 1.0
+margin_top = -40.0
+margin_right = 40.0
+grow_vertical = 0
 text = "Exit"
 
-[node name="Developed" type="Button" parent="."]
-margin_left = 54.0
-margin_top = 562.0
-margin_right = 90.0
-margin_bottom = 598.0
-text = "Developed"
-
-[connection signal="pressed" from="Exit" to="." method="_on_Exit_pressed"]
+[connection signal="pressed" from="Exit" to="." method="Exit"]
diff --git a/half-earth/nodes/ui/selection_mode_ui.tscn b/half-earth/nodes/ui/mode_selection_ui.tscn
similarity index 60%
rename from half-earth/nodes/ui/selection_mode_ui.tscn
rename to half-earth/nodes/ui/mode_selection_ui.tscn
index 58fd1c5..1916be8 100644
--- a/half-earth/nodes/ui/selection_mode_ui.tscn
+++ b/half-earth/nodes/ui/mode_selection_ui.tscn
@@ -1,8 +1,8 @@
 [gd_scene load_steps=2 format=2]
 
-[ext_resource path="res://scripts/ui/SelectionModeUI.cs" type="Script" id=1]
+[ext_resource path="res://scripts/ui/ModeSelectionUI.cs" type="Script" id=1]
 
-[node name="Selection Mode UI" type="Control"]
+[node name="Mode Selection UI" type="Control"]
 anchor_top = 1.0
 anchor_bottom = 1.0
 margin_top = -600.0
@@ -16,4 +16,4 @@ margin_right = 38.0
 margin_bottom = 598.0
 text = "Build Mode"
 
-[connection signal="pressed" from="Build Mode" to="." method="_on_Build_Mode_pressed"]
+[connection signal="pressed" from="Build Mode" to="." method="EnableBuildMode"]
diff --git a/half-earth/resources/tile_types/developed.tres b/half-earth/resources/tile_types/developed.tres
new file mode 100644
index 0000000..07fcbbf
--- /dev/null
+++ b/half-earth/resources/tile_types/developed.tres
@@ -0,0 +1,9 @@
+[gd_resource type="Resource" load_steps=2 format=2]
+
+[ext_resource path="res://scripts/TileType.cs" type="Script" id=1]
+
+[resource]
+script = ExtResource( 1 )
+Name = "Developed"
+Key = 68
+Color = Color( 0.372549, 0.372549, 0.372549, 1 )
diff --git a/half-earth/resources/tile_types/tile_type_collections/buildable_tiles.tres b/half-earth/resources/tile_types/tile_type_collections/buildable_tiles.tres
new file mode 100644
index 0000000..0491e19
--- /dev/null
+++ b/half-earth/resources/tile_types/tile_type_collections/buildable_tiles.tres
@@ -0,0 +1,8 @@
+[gd_resource type="Resource" load_steps=3 format=2]
+
+[ext_resource path="res://scripts/TileTypeCollection.cs" type="Script" id=1]
+[ext_resource path="res://resources/tile_types/developed.tres" type="Resource" id=2]
+
+[resource]
+script = ExtResource( 1 )
+_tileTypeResources = [ ExtResource( 2 ) ]
diff --git a/half-earth/scripts/GridCursor.cs b/half-earth/scripts/GridCursor.cs
index c6f7a1f..2d5be80 100644
--- a/half-earth/scripts/GridCursor.cs
+++ b/half-earth/scripts/GridCursor.cs
@@ -21,6 +21,9 @@ public class GridCursor : Sprite
 
     private const string T = "t";
 
+    public int X { get; private set; }
+    public int Y { get; private set; }
+
     public override void _Ready()
     {
         _grid = GetNode<WorldGrid>(Grid);
@@ -35,29 +38,32 @@ public class GridCursor : Sprite
         {
             var pos = mouseMoveEvent.Position;
             _grid.GetGridPos(pos, out var x, out var y);
-            this.Visible = _grid.IsInBounds(x, y);
-            var position = new Vector2(x + .5f, y + .5f) * _grid.CellSize;
+            X = x;
+            Y = y;
+
+            this.Visible = _grid.IsInBounds(X, Y);
+            var position = new Vector2(X + .5f, Y + .5f) * _grid.CellSize;
             this.Position = position;
             return;
         }
 
-        if (@event is InputEventMouseButton mouseButtonEvent)
-        {
-            var button = (ButtonList)mouseButtonEvent.ButtonIndex;
-            if (button != ButtonList.Left)
-                return;
+        //if (@event is InputEventMouseButton mouseButtonEvent)
+        //{
+        //    var button = (ButtonList)mouseButtonEvent.ButtonIndex;
+        //    if (button != ButtonList.Left)
+        //        return;
 
-            if (!mouseButtonEvent.Pressed)
-            {
-                _material.SetShaderParam(T, 0f);
-                return;
-            }
+        //    if (!mouseButtonEvent.Pressed)
+        //    {
+        //        _material.SetShaderParam(T, 0f);
+        //        return;
+        //    }
 
-            var pos = mouseButtonEvent.Position;
-            _grid.GetGridPos(pos, out var x, out var y);
-            _grid.SetTileValue(x, y, 1.0f);
-            _material.SetShaderParam(T, 1f);
-        }
+        //    var pos = mouseButtonEvent.Position;
+        //    _grid.GetGridPos(pos, out var x, out var y);
+        //    _grid.SetTileValue(x, y, 1.0f);
+        //    _material.SetShaderParam(T, 1f);
+        //}
     }
 
     public override void _Process(float delta)
diff --git a/half-earth/scripts/Tile.cs b/half-earth/scripts/Tile.cs
index f46e5ee..70560a0 100644
--- a/half-earth/scripts/Tile.cs
+++ b/half-earth/scripts/Tile.cs
@@ -5,4 +5,5 @@ public struct Tile
     public bool isHighlighted;
     public float value;
     public ShaderMaterial material;
+    public TileType type;
 }
\ No newline at end of file
diff --git a/half-earth/scripts/TileType.cs b/half-earth/scripts/TileType.cs
new file mode 100644
index 0000000..a358d72
--- /dev/null
+++ b/half-earth/scripts/TileType.cs
@@ -0,0 +1,18 @@
+using Godot;
+
+public class TileType : Resource
+{
+    [Export]
+    public string Name { get; private set; }
+
+    [Export]
+    public KeyList Key { get; private set; }
+
+    [Export]
+    public Color Color { get; private set; }
+
+    public override string ToString()
+    {
+        return Name;
+    }
+}
\ No newline at end of file
diff --git a/half-earth/scripts/TileTypeCollection.cs b/half-earth/scripts/TileTypeCollection.cs
new file mode 100644
index 0000000..d30c6e8
--- /dev/null
+++ b/half-earth/scripts/TileTypeCollection.cs
@@ -0,0 +1,46 @@
+using Godot;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+public class TileTypeCollection : Resource, IReadOnlyList<TileType>
+{
+    [Export]
+    private List<Resource> _tileTypeResources = new List<Resource>();
+
+    private List<TileType> TileTypes
+    {
+        get
+        {
+            if (_tileTypes != null)
+                return _tileTypes;
+
+            _tileTypes = new List<TileType>();
+
+            foreach (var resource in _tileTypeResources)
+            {
+                if (!(resource is TileType))
+                    throw new InvalidCastException($"{resource} must be a {typeof(TileType)}");
+
+                _tileTypes.Add((TileType)resource);
+            }
+
+            return _tileTypes;
+        }
+    }
+    private List<TileType> _tileTypes = null;
+
+    public TileType this[int index] => TileTypes[index];
+
+    public int Count => TileTypes.Count;
+
+    public IEnumerator<TileType> GetEnumerator()
+    {
+        return TileTypes.GetEnumerator();
+    }
+
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+        return TileTypes.GetEnumerator();
+    }
+}
diff --git a/half-earth/scripts/WorldGrid.cs b/half-earth/scripts/WorldGrid.cs
index 68640da..af72010 100644
--- a/half-earth/scripts/WorldGrid.cs
+++ b/half-earth/scripts/WorldGrid.cs
@@ -52,12 +52,14 @@ public class WorldGrid : Node2D
         _tiles[x, y].isHighlighted ^= true;
     }
 
-    public void SetTileValue(int x, int y, float value)
+    public void SetTileType(int x, int y, TileType tileType)
     {
         if (!IsInBounds(x, y))
             return;
 
-        _tiles[x, y].value = value;
+        GD.Print($"set ({x}, {y}) to {tileType}");
+        _tiles[x, y].type = tileType;
+        _tiles[x, y].material.SetShaderParam("lowColor", tileType.Color);
     }
 
     public void GetGridPos(Vector2 position, out int x, out int y)
diff --git a/half-earth/scripts/interaction_modes/BuildMode.cs b/half-earth/scripts/interaction_modes/BuildMode.cs
index 82e27fa..7add3ea 100644
--- a/half-earth/scripts/interaction_modes/BuildMode.cs
+++ b/half-earth/scripts/interaction_modes/BuildMode.cs
@@ -3,7 +3,126 @@ using System;
 
 public class BuildMode : Mode
 {
-    private const int NO_TILE_TYPE_SELECTED = -1;
+    [Export]
+    private NodePath _gridPath;
+    private WorldGrid _grid;
 
-    public int SelectedTileType { get; set; } = NO_TILE_TYPE_SELECTED;
+    [Export]
+    private NodePath _cursorPath;
+    private GridCursor _cursor;
+
+    [Export]
+    private Resource _buildableTilesResource;
+    public TileTypeCollection BuildableTiles { get; private set; }
+
+    public TileType SelectedTileType
+    {
+        get => _selectedTileType;
+        set
+        {
+            if (_selectedTileType == value)
+                return;
+
+            if (value != null)
+            {
+                GD.Print($"{GetType()}: selected {value} tile type");
+            }
+            else if (_selectedTileType != null)
+            {
+                GD.Print($"{GetType()}: cleared tile selection");
+            }
+
+            _selectedTileType = value;
+        }
+    }
+    private TileType _selectedTileType = null;
+
+    public override void _Ready()
+    {
+        base._Ready();
+
+        BuildableTiles = (TileTypeCollection)_buildableTilesResource;
+
+        foreach (var tt in BuildableTiles)
+        {
+            GD.Print(tt.Name);
+        }
+
+        _grid = GetNode<WorldGrid>(_gridPath);
+        _cursor = GetNode<GridCursor>(_cursorPath);
+    }
+
+    private void HandleKeyInput(InputEventKey keyEvent)
+    {
+        if (!(keyEvent.Pressed))
+            return;
+
+        var key = (KeyList)keyEvent.Scancode;
+
+        if (key == KeyList.Escape)
+        {
+            if (SelectedTileType != null)
+            {
+                SelectedTileType = null;
+                return;
+            }
+
+            Disable();
+        }
+
+        foreach (var tt in BuildableTiles)
+        {
+            if (key != tt.Key)
+                continue;
+
+            SelectedTileType = tt;
+        }
+    }
+
+    private void HandleMouseInput(InputEventMouse mouseEvent)
+    {
+        if (!(mouseEvent is InputEventMouseButton buttonEvent))
+            return;
+
+        if (!buttonEvent.Pressed)
+            return;
+
+        var button = (ButtonList)buttonEvent.ButtonIndex;
+        if (button != ButtonList.Left)
+            return;
+
+        if (SelectedTileType == null)
+            return;
+
+        _grid.SetTileType(_cursor.X, _cursor.Y, SelectedTileType);
+    }
+
+    public override void _Input(InputEvent @event)
+    {
+        base._Input(@event);
+
+        if (!Active)
+            return;
+
+        if (@event is InputEventKey keyEvent)
+        {
+            HandleKeyInput(keyEvent);
+            return;
+        }
+
+        if (@event is InputEventMouse mouseEvent)
+        {
+            HandleMouseInput(mouseEvent);
+            return;
+        }
+    }
+
+    protected override void OnEnabled()
+    {
+    }
+
+    protected override void OnDisabled()
+    {
+        SelectedTileType = null;
+    }
 }
diff --git a/half-earth/scripts/interaction_modes/InteractionModes.cs b/half-earth/scripts/interaction_modes/InteractionModes.cs
index dc51224..9536ff0 100644
--- a/half-earth/scripts/interaction_modes/InteractionModes.cs
+++ b/half-earth/scripts/interaction_modes/InteractionModes.cs
@@ -6,70 +6,52 @@ public class InteractionModes : Node
     [Export]
     private NodePath _buildModePath;
     private BuildMode _buildMode;
-    [Export]
-    private NodePath _selectionModePath;
-    private SelectionMode _selectionMode;
 
     [Signal]
     delegate void OnInteractionModeChanged(Mode oldMode, Mode newMode);
 
+    private Mode Mode
+    {
+        get => _current;
+        set
+        {
+            if (_current == value)
+                return;
+
+            if (value != null)
+            {
+                GD.Print($"set interaction mode: {value}");
+            }
+            else if (_current != null)
+            {
+                GD.Print($"clear interaction mode");
+            }
+
+            var old = _current;
+            _current = value;
+            EmitSignal(nameof(OnInteractionModeChanged), old, _current);
+        }
+    }
     private Mode _current = null;
 
     public override void _Ready()
     {
         base._Ready();
 
-        _selectionMode = GetNode<SelectionMode>(_selectionModePath);
         _buildMode = GetNode<BuildMode>(_buildModePath);
     }
 
-    public override void _Process(float delta)
-    {
-        base._Process(delta);
-
-        if (_current == null)
-        {
-            Reset();
-        }
-    }
-
     public void _on_Build_Mode_OnModeEntered()
     {
-        _selectionMode.Disable();
-        ChangeMode(_selectionMode, _buildMode);
+        Mode = _buildMode;
     }
     public void _on_Build_Mode_OnModeExited()
     {
-    }
-
-    public void _on_Selection_Mode_OnModeEntered()
-    {
-        _buildMode.Disable();
-        ChangeMode(_buildMode, _selectionMode);
-    }
-    public void _on_Selection_Mode_OnModeExited()
-    {
-    }
-
-    private void ChangeMode(Mode oldMode, Mode newMode)
-    {
-        if (oldMode == newMode)
-        {
-            throw new InvalidOperationException();
-        }
-
-        if (_current != null && oldMode != _current)
-        {
-            throw new InvalidOperationException();
-        }
-
-        _current = newMode;
-        EmitSignal(nameof(OnInteractionModeChanged), oldMode, newMode);
+        Mode = null;
     }
 
     public void Reset()
     {
         _buildMode.Disable();
-        _selectionMode.Enable();
     }
 }
diff --git a/half-earth/scripts/interaction_modes/Mode.cs b/half-earth/scripts/interaction_modes/Mode.cs
index 7e58739..59e8ade 100644
--- a/half-earth/scripts/interaction_modes/Mode.cs
+++ b/half-earth/scripts/interaction_modes/Mode.cs
@@ -50,11 +50,16 @@ public abstract class Mode : Node
     public void Enable()
     {
         Active = true;
+        OnEnabled();
     }
+    protected abstract void OnEnabled();
+
     public void Disable()
     {
         Active = false;
+        OnDisabled();
     }
+    protected abstract void OnDisabled();
 
     public override string ToString()
     {
diff --git a/half-earth/scripts/interaction_modes/SelectionMode.cs b/half-earth/scripts/interaction_modes/SelectionMode.cs
index 9e88fe0..1cb617e 100644
--- a/half-earth/scripts/interaction_modes/SelectionMode.cs
+++ b/half-earth/scripts/interaction_modes/SelectionMode.cs
@@ -3,4 +3,11 @@ using System;
 
 public class SelectionMode : Mode
 {
+    protected override void OnDisabled()
+    {
+    }
+
+    protected override void OnEnabled()
+    {
+    }
 }
diff --git a/half-earth/scripts/ui/BuildModeUI.cs b/half-earth/scripts/ui/BuildModeUI.cs
index 88f1a21..06b6de8 100644
--- a/half-earth/scripts/ui/BuildModeUI.cs
+++ b/half-earth/scripts/ui/BuildModeUI.cs
@@ -14,15 +14,41 @@ public class BuildModeUI : Control
     public override void _Ready()
     {
         _buildMode = GetNode<BuildMode>(_buildModePath);
-        Visible = false;
+
+        var buttonHeight = 40;
+        var tileType = _buildMode.BuildableTiles[0];
+        int x = 50;
+
+        SpawnButton(tileType, buttonHeight, ref x);
     }
 
-    public void _on_Exit_pressed()
+    private void SpawnButton(TileType tileType, int buttonHeight, ref int x)
     {
-        Exit();
+        const int MARGIN = 5;
+
+        var button = new Button();
+        this.AddChild(button);
+
+        button.Text = tileType.Name;
+        var parameters = new Godot.Collections.Array(tileType);
+        button.Connect("pressed", this, nameof(SelectTileType), parameters);
+
+        button.SetAnchorsPreset(LayoutPreset.BottomLeft);
+        button.MarginBottom = 0;
+
+        var size = button.RectSize;
+        button.RectSize = new Vector2(size.x, buttonHeight);
+
+        button.SetPosition(new Vector2(x, -buttonHeight));
+        x += Mathf.RoundToInt(size.x) + MARGIN;
     }
 
-    private void Exit()
+    private void SelectTileType(TileType tileType)
+    {
+        _buildMode.SelectedTileType = tileType;
+    }
+
+    public void Exit()
     {
         EmitSignal(nameof(OnExit));
     }
diff --git a/half-earth/scripts/ui/ModeSelectionUI.cs b/half-earth/scripts/ui/ModeSelectionUI.cs
new file mode 100644
index 0000000..5c8a4bd
--- /dev/null
+++ b/half-earth/scripts/ui/ModeSelectionUI.cs
@@ -0,0 +1,24 @@
+using Godot;
+using System;
+
+public class ModeSelectionUI : Control
+{
+    [Signal]
+    delegate void BuildModeEnabled();
+
+    public override void _Process(float delta)
+    {
+        base._Process(delta);
+    }
+
+    public void EnableBuildMode()
+    {
+        EmitSignal(nameof(BuildModeEnabled));
+        Visible = false;
+    }
+
+    public void Enable()
+    {
+        Visible = true;
+    }
+}
diff --git a/half-earth/scripts/ui/SelectionModeUI.cs b/half-earth/scripts/ui/SelectionModeUI.cs
deleted file mode 100644
index 10ef357..0000000
--- a/half-earth/scripts/ui/SelectionModeUI.cs
+++ /dev/null
@@ -1,26 +0,0 @@
-using Godot;
-using System;
-
-public class SelectionModeUI : Control
-{
-    [Signal]
-    delegate void EnableBuildMode();
-
-    [Export]
-    private NodePath _selectionModePath;
-    public SelectionMode _selectionMode;
-
-    public void _on_Build_Mode_pressed() => EmitSignal(nameof(EnableBuildMode));
-
-    public override void _Ready()
-    {
-        _selectionMode = GetNode<SelectionMode>(_selectionModePath);
-    }
-
-    public override void _Process(float delta)
-    {
-        base._Process(delta);
-
-        Visible = _selectionMode.Active;
-    }
-}