diff --git a/lib/camera.lua b/lib/camera.lua
index 2ef79a9..64de3a5 100644
--- a/lib/camera.lua
+++ b/lib/camera.lua
@@ -73,6 +73,16 @@ function camera:attach()
     love.graphics.translate(-self.position.x, -self.position.y)
 end
 
+--- @param position Vec3
+function camera:toWorldPosition(position)
+    local wx, wy = love.window.getMode()
+    position = Vec3 {
+        (position.x - wx / 2) / Tree.level.camera.pixelsPerMeter / Tree.level.camera.scale + Tree.level.camera.position.x,
+        (position.y - wy / 2) / Tree.level.camera.pixelsPerMeter / Tree.level.camera.scale + Tree.level.camera.position.y
+    }
+    return position
+end
+
 function camera:detach()
     love.graphics.pop()
 end
diff --git a/lib/character.lua b/lib/character.lua
index d810846..327450b 100644
--- a/lib/character.lua
+++ b/lib/character.lua
@@ -4,7 +4,10 @@ require 'lib/vec3'
 --- Скорость между кадрами в анимации
 local ANIMATION_SPEED = 0.1
 
+local characterId = 1
+
 --- @class Character
+--- @field id integer
 --- @field name string
 --- @field animationTable table<string, table>
 --- @field state "idle"|"run"|"attack"|"hurt"
@@ -35,8 +38,11 @@ local function spawn(name, spriteDir, level)
         animationTable = {}
     }
 
+    char.id = characterId
+    characterId = characterId + 1
+
     char.position = Vec3({})
-    char.size = Vec3({})
+    char.size = Vec3({ 1, 1 })
 
     char.state = "idle"
 
@@ -58,10 +64,8 @@ local function spawn(name, spriteDir, level)
     char.stats.defence = 0
     char.stats.hp = 30
 
-    print(char)
-
     char = setmetatable(char, character)
-    table.insert(Tree.level.characters, char)
+    Tree.level.characters[char.id] = char
     return char
 end
 
diff --git a/lib/controls.lua b/lib/controls.lua
index bd788e2..aadb759 100644
--- a/lib/controls.lua
+++ b/lib/controls.lua
@@ -8,7 +8,6 @@ local function control(device, key)
     return t
 end
 
-
 local keymap = {
     cameraMoveUp = control("key", "w"),
     cameraMoveLeft = control("key", "a"),
diff --git a/lib/grid.lua b/lib/grid.lua
index 1c7f41b..6c4709c 100644
--- a/lib/grid.lua
+++ b/lib/grid.lua
@@ -1,14 +1,47 @@
 local utils = require "lib/utils"
 
----Generates an empty grid
----@param width number
----@param height number
+--- @class Grid
+local grid = {}
+grid.__index = grid
+
+--- Adds a character id to the grid
+--- @param character Character
+function grid:add(character)
+    local centerX, centerY = character.position.x, character.position.y
+    local sizeX, sizeY     = character.size.x, character.size.y
+
+    for y = centerY, centerY + sizeY - 1 do
+        for x = centerX, centerX + sizeX - 1 do
+            grid[x][y] = character.id
+        end
+    end
+end
+
+--- Removes a character id from the grid
+--- @param character Character
+function grid:remove(character)
+    local centerX, centerY = character.position.x, character.position.y
+    local sizeX, sizeY     = character.size.x, character.size.y
+
+    for y = centerY, centerY + sizeY - 1 do
+        for x = centerX, centerX + sizeX - 1 do
+            grid[x][y] = nil
+        end
+    end
+end
+
+--- Generates an empty grid
+--- @param width number
+--- @param height number
+--- @return Grid
 local function generateGrid(width, height)
-    local grid = utils.generateList(width, function(i)
-        return utils.generateList(height, function(i)
-            return {}
+    local g = utils.generateList(width, function(_)
+        return utils.generateList(height, function(_)
+            return nil
         end)
     end)
 
-    return grid
+    return setmetatable(g, grid)
 end
+
+return { new = generateGrid }
diff --git a/lib/level.lua b/lib/level.lua
index 417f240..2de7e7e 100644
--- a/lib/level.lua
+++ b/lib/level.lua
@@ -1,8 +1,9 @@
 local utils = require "lib/utils"
-local camera = require "lib/camera"
 
 --- @class Level
 --- @field characters Character[]
+--- @field positionGrid Grid
+--- @field selected table
 --- @field camera Camera
 local level = {}
 level.__index = level
@@ -10,7 +11,8 @@ level.__index = level
 local function new()
     return setmetatable({
         characters = {},
-        camera = camera.new()
+        positionGrid = (require "lib/grid").new(30, 30), -- magic numbers for testing purposes only
+        camera = (require "lib/camera").new()
     }, level)
 end
 
diff --git a/main.lua b/main.lua
index 5838273..7430e1a 100644
--- a/main.lua
+++ b/main.lua
@@ -33,7 +33,6 @@ function love.draw()
     love.graphics.setColor(244 / 255, 67 / 255, 54 / 255, 1)
     love.graphics.rectangle('fill', 0, 0, 1, 1)
     love.graphics.setColor(1, 1, 1, 1)
-
     Tree.level:draw()
     Tree.level.camera:detach()
 end