diff --git a/nodes/GridContext.gd b/nodes/GridContext.gd
index 825d15f..be55757 100644
--- a/nodes/GridContext.gd
+++ b/nodes/GridContext.gd
@@ -1,6 +1,6 @@
 tool
 extends TK_Context
-class_name TK_GridContext
+class_name n_parent
 
 ## todo: Cell visualization.
 ## todo: Integration of TileMap.
@@ -30,7 +30,8 @@ func try_moving(p_game_object: Node2D, p_from: Vector2, p_to: Vector2) -> bool:
 
 func register_collider(p_collider: Node) -> void:
     _colliders[p_collider] = null
-    if p_collider.connect("child_exiting_tree", self, "_on_collider_exiting_tree") != OK:
+    if not p_collider.is_connected("child_exiting_tree", self, "_on_collider_exiting_tree") and \
+            p_collider.connect("child_exiting_tree", self, "_on_collider_exiting_tree") != OK:
         assert(false)
 
 func _on_collider_exiting_tree(p_collider) -> void:
diff --git a/nodes/TileMapObject.gd b/nodes/TileMapObject.gd
index 58b41ea..3811f5d 100644
--- a/nodes/TileMapObject.gd
+++ b/nodes/TileMapObject.gd
@@ -2,10 +2,13 @@ tool
 extends TileMap
 
 # todo: Give care about descriptor swaps being loseless / non introducing artifacts.
+# todo: Prevent user from deleting or editing tile_set property.
 
+# todo: Update it when changed.
 ## Dictates whether tileset collision information should be exposed to game context.
 export var expose_collisions: bool = true
 
+# todo: Use Node identity instead of name.
 var _descriptor_name_to_id: Dictionary # String to int
 var _id_to_descriptor_name: Dictionary # int to String
 
@@ -29,16 +32,26 @@ func is_path_traversible(p_game_object: Node2D, p_from: Vector2, p_to: Vector2)
 
 func _enter_tree() -> void:
     tile_set = TileSet.new()
-    get_parent().register_collider(self)
+
+    var n_parent := get_parent()
+    if not n_parent is TK_Context:
+        return
+
+    n_parent.register_collider(self)
 
     # It's okay to fail here for non-grid contexts.
-    if get_parent().connect("cell_size_changed", self, "_update_cell_size"):
-        _update_cell_size(get_parent().cell_size, get_parent().cell_size)
-
-    if connect("child_entered_tree", self, "_on_child_entered_tree") != OK:
+    if not n_parent.is_connected("cell_size_changed", self, "_update_cell_size") and \
+            n_parent.connect("cell_size_changed", self, "_update_cell_size") != OK:
         assert(false)
 
-    if connect("child_exiting_tree", self, "_on_child_exiting_tree") != OK:
+    _update_cell_size(n_parent.cell_size, n_parent.cell_size)
+
+    if not is_connected("child_entered_tree", self, "_on_child_entered_tree") and \
+            connect("child_entered_tree", self, "_on_child_entered_tree") != OK:
+        assert(false)
+
+    if not is_connected("child_exiting_tree", self, "_on_child_exiting_tree") and \
+            connect("child_exiting_tree", self, "_on_child_exiting_tree") != OK:
         assert(false)
 
 func _update_cell_size(_p_old_cell_size: Vector2, p_new_cell_size: Vector2) -> void:
@@ -56,11 +69,13 @@ func _on_child_entered_tree(p_node: Node) -> void:
     _id_to_descriptor_name[id] = p_node.name
     tile_set.create_tile(id)
     tile_set.tile_set_texture(id, p_node.texture)
+    if not p_node.id.empty():
+        tile_set.tile_set_name(id, p_node.id)
 
 func _on_child_exiting_tree(p_node: Node) -> void:
     var id := _descriptor_name_to_id[p_node.name] as int
     for cell in get_used_cells_by_id(id):
-        set_cell(cell.x, cell.y, -1)
+        set_cellv(cell, -1)
     tile_set.remove_tile(id)
     if not _descriptor_name_to_id.erase(p_node.name):
         assert(false)
diff --git a/nodes/TileMapTileDescriptor.gd b/nodes/TileMapTileDescriptor.gd
index 9b695c0..db1afa1 100644
--- a/nodes/TileMapTileDescriptor.gd
+++ b/nodes/TileMapTileDescriptor.gd
@@ -7,6 +7,10 @@ export var texture: Texture setget _set_texture
 # todo: More layer customizeability.
 export var is_solid: bool
 
+# todo: Update TileMapObject in editor when it's changed.
+export var id: String = ""
+
+# todo: Should work for non-grid objects.
 func is_traversible_for(_p_game_object: Node2D) -> bool:
     return not is_solid
 
diff --git a/project.godot b/project.godot
index 6f8c846..6853519 100644
--- a/project.godot
+++ b/project.godot
@@ -134,15 +134,15 @@ _global_script_classes=[ {
 "language": "GDScript",
 "path": "res://nodes/GameObject.gd"
 }, {
-"base": "TK_Context",
-"class": "TK_GridContext",
-"language": "GDScript",
-"path": "res://nodes/GridContext.gd"
-}, {
 "base": "Node",
 "class": "TK_TileMapTileDescriptor",
 "language": "GDScript",
 "path": "res://nodes/TileMapTileDescriptor.gd"
+}, {
+"base": "TK_Context",
+"class": "n_parent",
+"language": "GDScript",
+"path": "res://nodes/GridContext.gd"
 } ]
 _global_script_class_icons={
 "BrushPrefabs": "",
@@ -170,14 +170,15 @@ _global_script_class_icons={
 "TK_Controller": "",
 "TK_FittingSprite": "",
 "TK_GameObject": "",
-"TK_GridContext": "",
-"TK_TileMapTileDescriptor": ""
+"TK_TileMapTileDescriptor": "",
+"n_parent": ""
 }
 
 [application]
 
 config/name="TochieKit"
 run/main_scene="res://scenes/Game.tscn"
+run/low_processor_mode=true
 config/icon="res://icon.png"
 
 [autoload]
@@ -226,6 +227,15 @@ move_left={
  ]
 }
 
+[input_devices]
+
+buffering/agile_event_flushing=true
+pointing/emulate_touch_from_mouse=true
+
+[node]
+
+name_num_separator=3
+
 [physics]
 
 common/enable_pause_aware_picking=true
@@ -233,8 +243,18 @@ common/enable_pause_aware_picking=true
 [rendering]
 
 quality/driver/driver_name="GLES2"
+quality/intended_usage/framebuffer_allocation=1
+quality/intended_usage/framebuffer_allocation.mobile=1
 2d/snapping/use_gpu_pixel_snap=true
+threads/thread_model=2
 vram_compression/import_etc=true
 vram_compression/import_etc2=false
+quality/reflections/texture_array_reflections=false
+quality/shading/force_vertex_shading=true
+quality/shading/force_lambert_over_burley=true
+quality/shading/force_blinn_over_ggx=true
+quality/filters/use_nearest_mipmap_filter=true
+batching/options/single_rect_fallback=true
+quality/lightmapping/use_bicubic_sampling=false
 environment/default_clear_color=Color( 0.00784314, 0, 0.117647, 1 )
 environment/default_environment="res://default_env.tres"
diff --git a/scenes/Game.tscn b/scenes/Game.tscn
index 9a57c5d..d6c05e3 100644
--- a/scenes/Game.tscn
+++ b/scenes/Game.tscn
@@ -6,11 +6,11 @@
 [ext_resource path="res://nodes/GridContext.tscn" type="PackedScene" id=4]
 [ext_resource path="res://nodes/GameObject.tscn" type="PackedScene" id=5]
 [ext_resource path="res://art/tiles/brickwall.png" type="Texture" id=6]
-[ext_resource path="res://nodes/TileMapObject.gd" type="Script" id=7]
+[ext_resource path="res://nodes/TileMapObject.tscn" type="PackedScene" id=7]
 [ext_resource path="res://scenes/tiles/Brickwall.tscn" type="PackedScene" id=8]
 
 [sub_resource type="TileSet" id=1]
-0/name = ""
+0/name = "tk.Brickwall"
 0/texture = ExtResource( 6 )
 0/tex_offset = Vector2( 0, 0 )
 0/modulate = Color( 1, 1, 1, 1 )
@@ -29,14 +29,11 @@
 
 [node name="GridContext" parent="." instance=ExtResource( 4 )]
 
-[node name="TileMapObject" type="TileMap" parent="GridContext"]
+[node name="TileMapObject" parent="GridContext" instance=ExtResource( 7 )]
 scale = Vector2( 4, 4 )
 tile_set = SubResource( 1 )
 cell_size = Vector2( 16, 16 )
-bake_navigation = true
-format = 1
-tile_data = PoolIntArray( 0, 0, 0, 1, 0, 0, 2, 0, 0, 3, 0, 0, 4, 0, 0, 5, 0, 0, 6, 0, 0, 7, 0, 0, 8, 0, 0, 9, 0, 0, 10, 0, 0, 11, 0, 0, 12, 0, 0, 13, 0, 0, 14, 0, 0, 15, 0, 0, 65536, 0, 0, 65551, 0, 0, 131072, 0, 0, 131074, 0, 0, 131085, 0, 0, 131087, 0, 0, 196608, 0, 0, 196623, 0, 0, 262144, 0, 0, 262146, 0, 0, 262157, 0, 0, 262159, 0, 0, 327680, 0, 0, 327695, 0, 0, 393216, 0, 0, 393218, 0, 0, 393219, 0, 0, 393220, 0, 0, 393221, 0, 0, 393222, 0, 0, 393223, 0, 0, 393224, 0, 0, 393225, 0, 0, 393226, 0, 0, 393227, 0, 0, 393228, 0, 0, 393229, 0, 0, 393231, 0, 0, 458752, 0, 0, 458767, 0, 0, 524288, 0, 0, 524289, 0, 0, 524290, 0, 0, 524291, 0, 0, 524292, 0, 0, 524293, 0, 0, 524294, 0, 0, 524295, 0, 0, 524296, 0, 0, 524297, 0, 0, 524298, 0, 0, 524299, 0, 0, 524300, 0, 0, 524301, 0, 0, 524302, 0, 0, 524303, 0, 0 )
-script = ExtResource( 7 )
+tile_data = PoolIntArray( 0, 0, 0, 1, 0, 0, 2, 0, 0, 3, 0, 0, 4, 0, 0, 5, 0, 0, 6, 0, 0, 7, 0, 0, 8, 0, 0, 9, 0, 0, 10, 0, 0, 11, 0, 0, 12, 0, 0, 13, 0, 0, 14, 0, 0, 15, 0, 0, 65536, 0, 0, 65551, 0, 0, 131072, 0, 0, 131087, 0, 0, 196608, 0, 0, 196623, 0, 0, 262144, 0, 0, 262159, 0, 0, 327680, 0, 0, 327695, 0, 0, 393216, 0, 0, 393231, 0, 0, 458752, 0, 0, 458767, 0, 0, 524288, 0, 0, 524289, 0, 0, 524290, 0, 0, 524291, 0, 0, 524292, 0, 0, 524293, 0, 0, 524294, 0, 0, 524295, 0, 0, 524296, 0, 0, 524297, 0, 0, 524298, 0, 0, 524299, 0, 0, 524300, 0, 0, 524301, 0, 0, 524302, 0, 0, 524303, 0, 0 )
 
 [node name="Brickwall" parent="GridContext/TileMapObject" instance=ExtResource( 8 )]
 
diff --git a/scenes/tiles/Brickwall.tscn b/scenes/tiles/Brickwall.tscn
index 0b65570..3da5906 100644
--- a/scenes/tiles/Brickwall.tscn
+++ b/scenes/tiles/Brickwall.tscn
@@ -7,3 +7,4 @@
 script = ExtResource( 2 )
 texture = ExtResource( 1 )
 is_solid = true
+id = "tk.Brickwall"