diff --git a/debug/debug_highlight_tester.gd b/debug/debug_highlight_tester.gd
new file mode 100644
index 0000000..5c4fdcd
--- /dev/null
+++ b/debug/debug_highlight_tester.gd
@@ -0,0 +1,11 @@
+extends Node2D
+
+@export var grid: Grid
+
+
+func _on_timer_timeout() -> void:
+	GameplaySignalBus.highlight_empty.emit(grid.raycast_empty(global_position,transform.x))
+	rotation_degrees += 5
+
+func _process(delta: float) -> void:
+	global_position = get_global_mouse_position()
diff --git a/debug/debug_highlight_tester.gd.uid b/debug/debug_highlight_tester.gd.uid
new file mode 100644
index 0000000..56d5b49
--- /dev/null
+++ b/debug/debug_highlight_tester.gd.uid
@@ -0,0 +1 @@
+uid://c7i44ghoo4kqo
diff --git a/project.godot b/project.godot
index e9f75fe..cbfa5e6 100644
--- a/project.godot
+++ b/project.godot
@@ -15,6 +15,20 @@ run/main_scene="uid://bxt4kgs6px3t8"
 config/features=PackedStringArray("4.6", "GL Compatibility")
 config/icon="res://icon.svg"
 
+[autoload]
+
+GameplaySignalBus="*uid://cqh0t2i1slf8u"
+
+[debug]
+
+gdscript/warnings/integer_division=0
+
+[display]
+
+window/size/viewport_width=1920
+window/size/viewport_height=1080
+window/stretch/mode="canvas_items"
+
 [internationalization]
 
 locale/translations=PackedStringArray("res://translations/units.ru.translation", "res://translations/units.en.translation")
diff --git a/scenes/game.tscn b/scenes/game.tscn
index 743d78f..5809808 100644
--- a/scenes/game.tscn
+++ b/scenes/game.tscn
@@ -6,6 +6,10 @@
 [ext_resource type="Resource" uid="uid://e7kiu3wcf0ff" path="res://cards/resources/fosma.tres" id="3_u5sy4"]
 [ext_resource type="Resource" uid="uid://djqlx7bmcs5gj" path="res://cards/resources/doh.tres" id="4_gee14"]
 [ext_resource type="Resource" uid="uid://b6kiwb0marpng" path="res://cards/resources/zlosma.tres" id="5_0tnpc"]
+[ext_resource type="Script" uid="uid://rt6mxr30u8tp" path="res://systems/grid.gd" id="7_u5sy4"]
+[ext_resource type="Script" uid="uid://bmy5djjmiljhl" path="res://systems/grid_highlighter.gd" id="8_gee14"]
+[ext_resource type="Script" uid="uid://c7i44ghoo4kqo" path="res://debug/debug_highlight_tester.gd" id="9_0tnpc"]
+[ext_resource type="Texture2D" uid="uid://du3h8ou2sxh6s" path="res://units/fosma/fosma.png" id="10_vtaks"]
 
 [node name="Game" type="Node2D" unique_id=619820575]
 
@@ -13,9 +17,14 @@
 texture = ExtResource("1_iywne")
 centered = false
 
+[node name="Fosma" type="Sprite2D" parent="." unique_id=128278442]
+position = Vector2(511, 278)
+texture = ExtResource("10_vtaks")
+
 [node name="PlayerInterface" type="CanvasLayer" parent="." unique_id=269857956]
 
 [node name="Hand" type="Control" parent="PlayerInterface" unique_id=403305026]
+visible = false
 layout_mode = 3
 anchors_preset = 12
 anchor_top = 1.0
@@ -31,9 +40,10 @@ layout_mode = 0
 anchors_preset = 0
 anchor_right = 0.0
 anchor_bottom = 0.0
-offset_left = 402.0
-offset_right = 515.0
-offset_bottom = 169.0
+offset_left = 733.9999
+offset_top = -168.99997
+offset_right = 846.9999
+offset_bottom = 3.0517578e-05
 card_resource = ExtResource("3_u5sy4")
 
 [node name="Card2" parent="PlayerInterface/Hand" unique_id=1229293312 instance=ExtResource("2_p57ef")]
@@ -41,9 +51,10 @@ layout_mode = 0
 anchors_preset = 0
 anchor_right = 0.0
 anchor_bottom = 0.0
-offset_left = 519.0
-offset_right = 632.0
-offset_bottom = 169.0
+offset_left = 846.9999
+offset_top = -168.99997
+offset_right = 959.99994
+offset_bottom = 3.0517578e-05
 card_resource = ExtResource("4_gee14")
 
 [node name="Card4" parent="PlayerInterface/Hand" unique_id=1427311772 instance=ExtResource("2_p57ef")]
@@ -51,9 +62,10 @@ layout_mode = 0
 anchors_preset = 0
 anchor_right = 0.0
 anchor_bottom = 0.0
-offset_left = 804.0
-offset_right = 917.0
-offset_bottom = 169.0
+offset_left = 959.9999
+offset_top = -168.99997
+offset_right = 1072.9999
+offset_bottom = 3.0517578e-05
 card_resource = ExtResource("3_u5sy4")
 
 [node name="Card3" parent="PlayerInterface/Hand" unique_id=1907397406 instance=ExtResource("2_p57ef")]
@@ -61,7 +73,38 @@ layout_mode = 0
 anchors_preset = 0
 anchor_right = 0.0
 anchor_bottom = 0.0
-offset_left = 636.0
-offset_right = 749.0
-offset_bottom = 169.0
+offset_left = 1072.9998
+offset_top = -168.99997
+offset_right = 1185.9998
+offset_bottom = 3.0517578e-05
 card_resource = ExtResource("5_0tnpc")
+
+[node name="Grid" type="Node2D" parent="." unique_id=1478060666 node_paths=PackedStringArray("right_border_marker")]
+position = Vector2(398, 162)
+script = ExtResource("7_u5sy4")
+rows = 5
+columns = 5
+right_border_marker = NodePath("../GridMarker")
+metadata/_custom_type_script = "uid://rt6mxr30u8tp"
+
+[node name="Highlighter" type="Node2D" parent="Grid" unique_id=69750982]
+script = ExtResource("8_gee14")
+
+[node name="GridMarker" type="Marker2D" parent="." unique_id=1656515901]
+position = Vector2(801, 567)
+
+[node name="Camera2D" type="Camera2D" parent="." unique_id=1988509991]
+position = Vector2(0, 142)
+anchor_mode = 0
+zoom = Vector2(1.5, 1.5)
+
+[node name="HighlightTester" type="Node2D" parent="." unique_id=729091083 node_paths=PackedStringArray("grid")]
+position = Vector2(602, 362)
+script = ExtResource("9_0tnpc")
+grid = NodePath("../Grid")
+
+[node name="Timer" type="Timer" parent="HighlightTester" unique_id=1589504194]
+wait_time = 0.1
+autostart = true
+
+[connection signal="timeout" from="HighlightTester/Timer" to="HighlightTester" method="_on_timer_timeout"]
diff --git a/systems/gameplay_signal_bus.gd b/systems/gameplay_signal_bus.gd
new file mode 100644
index 0000000..716201d
--- /dev/null
+++ b/systems/gameplay_signal_bus.gd
@@ -0,0 +1,6 @@
+extends Node
+
+@warning_ignore_start("unused_signal")
+
+signal highlight_empty(empty: Array[int])
+signal highlight_units(unit: Array[int])
diff --git a/systems/gameplay_signal_bus.gd.uid b/systems/gameplay_signal_bus.gd.uid
new file mode 100644
index 0000000..aa9f8dc
--- /dev/null
+++ b/systems/gameplay_signal_bus.gd.uid
@@ -0,0 +1 @@
+uid://cqh0t2i1slf8u
diff --git a/systems/grid.gd b/systems/grid.gd
new file mode 100644
index 0000000..8a26b15
--- /dev/null
+++ b/systems/grid.gd
@@ -0,0 +1,169 @@
+extends Node2D
+
+
+## Grid with cells in it
+class_name Grid
+
+## Out of bounds return value
+const OUT_OF_BOUNDS: int = -1
+
+## Amount of rows (max Y value)
+@export var rows: int = 1
+## Amount of columns (max X value)
+@export var columns: int = 1
+
+## Node that marks right down position of grid
+@export var right_border_marker: Node2D
+
+## Computed size of one cell
+@onready var cell_size = (right_border_marker.global_position - global_position) / Vector2(columns,rows)
+## Computed rect of grid
+@onready var rect: Rect2 = Rect2(global_position,(right_border_marker.global_position - global_position))
+
+## Array that holds units
+var grid: Array[Unit] = []
+
+func _ready() -> void:
+	grid.resize(rows*columns)
+
+## Returns true if position is in bounds else returns false.
+func is_position_valid(pos: Vector2) -> bool:
+	return rect.has_point(pos)
+
+## Turns position into internal array index. Returns -1 if position is incorrect
+func to_index(pos: Vector2) -> int:
+	if is_position_valid(pos) == false: return OUT_OF_BOUNDS
+	var snapped_position: Vector2 = (pos - global_position)/cell_size
+	return int(snapped_position.x) + columns * int(snapped_position.y)
+
+## Turns index into global world position
+func from_index(index: int, centered: bool = false) -> Vector2:
+	if index < 0 or index >= columns * rows:
+		return Vector2.ZERO
+	return Vector2(index % columns, index / columns) * cell_size + (cell_size/2.0 if centered else Vector2.ZERO)
+
+## Snaps position through grid
+func snap_position(pos: Vector2, centered: bool = false) -> Vector2:
+	return global_position + (pos - global_position).snapped(cell_size) + (cell_size / 2) if centered else Vector2.ZERO
+
+## Returns position as grid snapped local coordinates
+func to_snapped(pos: Vector2) -> Vector2:
+	if is_position_valid(pos) == false: return Vector2.ZERO
+	var snapped_position: Vector2 = (pos - global_position)/cell_size
+	return Vector2(floor(snapped_position.x),floor(snapped_position.y))
+
+## Tries to set unit at position and returns false if unit already exists or out of bounds
+func try_set_unit(pos: Vector2, unit: Unit) -> bool:
+	var index: int = to_index(pos)
+	if index == OUT_OF_BOUNDS:
+		return false
+	
+	if grid[index] != null:
+		return false
+	
+	grid[index] = unit
+	return true
+
+## Returns true if cell is occupied or out of bounds and false if cell is empty.
+func is_occupied(pos: Vector2) -> bool:
+	var index: int = to_index(pos)
+	if index == OUT_OF_BOUNDS:
+		return true
+	
+	return grid[index] != null
+
+## Returns units with given rule predicate.[br]
+## rule - predicate with signature [code](x,y,source_x,source_y)[/code] -> bool 
+## that needs to return true if cell needs to be checked.[br]
+## unit - source unit.
+func get_units(rule: Callable,unit: Unit) -> Array[Unit]:
+	var unit_pos = to_snapped(unit.global_position)
+	var result: Array[Unit] = []
+	for i in range(columns * rows):
+		if rule.call(i%columns,i/columns,int(unit_pos.x),int(unit_pos.y)) and grid[i] != null:
+			result.append(grid[i])
+	
+	return result
+
+## WIP[br]
+## Returns units with given rule predicate. Checks from source unit with rays and stops only when ray failed.[br]
+## rule - predicate with signature [code](x,y,source_x,source_y)[/code] -> bool 
+## that needs to return true if cell needs to be checked.[br]
+## unit - source unit.[br]
+## rays - amount of rays to check from unit.
+func get_units_stoppable(rule: Callable, unit: Unit, rays: int = 8) -> Array[Unit]:
+	return []
+
+## Returns empty cells with given rule predicate.[br]
+## rule - predicate with signature [code](x,y,source_x,source_y)[/code] -> bool 
+## that needs to return true if cell needs to be checked.[br]
+## unit - source unit.
+func get_empty(rule: Callable, unit: Unit) -> Array[int]:
+	var unit_pos = to_snapped(unit.global_position)
+	var result: Array[int] = []
+	for i: int in range(columns * rows):
+		if rule.call(i%columns,i/columns,int(unit_pos.x),int(unit_pos.y)) and grid[i] == null:
+			result.append(i)
+	
+	return result
+
+## WIP[br]
+## Returns empty with given rule predicate. Checks from source unit with rays and stops only when ray failed.[br]
+## rule - predicate with signature [code](x,y,source_x,source_y)[/code] -> bool 
+## that needs to return true if cell needs to be checked.[br]
+## unit - source unit.[br]
+## rays - amount of rays to check from unit.
+func get_empty_stoppable(rule: Callable, unit: Unit, rays: int = 8) -> Array[int]:
+	return []
+
+## Casts a ray along [code]direction[/code] from [code]from[/code] to find unit. If distance is given, restricts lookup to [code]distance[/code] cells.
+func raycast_unit(from: Vector2,direction: Vector2,distance: float = -1) -> Unit:
+	if not direction.is_normalized():
+		direction = direction.normalized()
+	var result = null
+	
+	var to: Vector2 = from + direction * rows * columns
+	var dv: Vector2 = to.floor() - from.floor()
+	var step = abs(dv.x) + 1 if abs(dv.x) > abs(dv.y) else abs(dv.y) + 1
+	var check_pos = from
+	
+	while is_position_valid(check_pos) and distance != 0:
+		check_pos += dv/step
+		distance -= 1
+	
+	return result
+
+## Casts a ray along [code]direction[/code] from [code]from[/code] to find all empty cells. If distance is given, restricts lookup to [code]distance[/code] cells.
+func raycast_empty(from: Vector2,direction: Vector2,distance: float = -1) -> Array[int]:
+	if not direction.is_normalized():
+		direction = direction.normalized()
+	var result: Array[int] = []
+	
+	var dv: Vector2 = (Vector2.ONE/direction).round()
+	var steps_y: int = int(abs(dv.y))
+	var steps_x: int = int(abs(dv.x))
+	var check_pos = from.floor()
+	var change_y: bool = true if abs(dv.y) > abs(dv.x) else false
+	
+	while is_position_valid(check_pos) and distance != 0:
+		if steps_x == 0:
+			steps_x = int(abs(dv.x))
+			change_y = true
+		elif steps_y == 0:
+			steps_y = int(abs(dv.y))
+			change_y = false
+		
+		if change_y:
+			check_pos += Vector2(0,sign(dv.y)) * cell_size
+			steps_y-=1
+		else:
+			check_pos += Vector2(sign(dv.x),0) * cell_size
+			steps_x -= 1
+		
+		var index = to_index(check_pos)
+		if index == -1:
+			break
+		if grid[index] == null:
+			result.append(index)
+	
+	return result
diff --git a/systems/grid.gd.uid b/systems/grid.gd.uid
new file mode 100644
index 0000000..422a87b
--- /dev/null
+++ b/systems/grid.gd.uid
@@ -0,0 +1 @@
+uid://rt6mxr30u8tp
diff --git a/systems/grid_highlighter.gd b/systems/grid_highlighter.gd
new file mode 100644
index 0000000..5adbca1
--- /dev/null
+++ b/systems/grid_highlighter.gd
@@ -0,0 +1,29 @@
+extends Node2D
+
+@onready var grid: Grid = get_parent()
+
+const UNIT_COLOR = Color.CHOCOLATE
+const EMPTY_COLOR = Color(Color.CORNFLOWER_BLUE,1.0)
+
+var units: Array[Vector2]
+var empty: Array[Vector2]
+
+func _ready() -> void:
+	GameplaySignalBus.highlight_empty.connect(on_highlight_empty)
+	GameplaySignalBus.highlight_units.connect(on_highlight_units)
+
+func _draw() -> void:
+	for unit in units:
+		draw_rect(Rect2(unit,grid.cell_size),UNIT_COLOR)
+	for empty_cell in empty:
+		draw_rect(Rect2(empty_cell,grid.cell_size),EMPTY_COLOR)
+
+func on_highlight_units(new_units: Array[Unit]):
+	units.clear()
+	units.assign(new_units.map(func(unit : Unit): return grid.snap_position(unit.global_position)))
+	queue_redraw()
+
+func on_highlight_empty(new_empty: Array[int]):
+	empty.clear()
+	empty.assign(new_empty.map(func(cell: int): return grid.from_index(cell)))
+	queue_redraw()
diff --git a/systems/grid_highlighter.gd.uid b/systems/grid_highlighter.gd.uid
new file mode 100644
index 0000000..56cd298
--- /dev/null
+++ b/systems/grid_highlighter.gd.uid
@@ -0,0 +1 @@
+uid://bmy5djjmiljhl
diff --git a/translations/units.en.translation b/translations/units.en.translation
index 7170bd9..8e57892 100644
Binary files a/translations/units.en.translation and b/translations/units.en.translation differ
diff --git a/translations/units.ru.translation b/translations/units.ru.translation
index 78183af..5cc89d2 100644
Binary files a/translations/units.ru.translation and b/translations/units.ru.translation differ
diff --git a/units/unit.gd b/units/unit.gd
new file mode 100644
index 0000000..5838e08
--- /dev/null
+++ b/units/unit.gd
@@ -0,0 +1,5 @@
+extends Node2D
+
+class_name Unit
+
+signal on_death
diff --git a/units/unit.gd.uid b/units/unit.gd.uid
new file mode 100644
index 0000000..ae64109
--- /dev/null
+++ b/units/unit.gd.uid
@@ -0,0 +1 @@
+uid://db7simgenakts