diff --git a/main.lua b/main.lua
new file mode 100644
index 0000000..2f52d0f
--- /dev/null
+++ b/main.lua
@@ -0,0 +1,33 @@
+require "ui.globals"
+require "ui.config"
+require "ui.colors"
+require "ui.init"
+require "ui.draw"
+require "ui.keyboard"
+require "ui.mouse"
+
+
+function love.load()
+    love.window.setTitle("Sudoku!")
+    love.window.setMode(0, 0)
+    love.mouse.setGrabbed(false)
+    love.keyboard.setKeyRepeat(true)
+    math.randomseed(os.time())
+    initSmallNumbers()
+    initGrid()
+    messages[1] = "Game Info"
+end
+
+function love.update(dt)
+end
+
+function love.draw()
+    -- love.graphics.setBackgroundColor(colors.backGround)
+    setBackgroundColor(colors.backGround)
+    drawGrid()
+    drawSmallNumbers()
+    drawCursor()
+    drawMessages()
+    love.graphics.setFont(fonts.bigNum)
+    love.graphics.print("5", grid[5][5].x1+25, grid[5][5].y1+10)
+end
diff --git a/boards.lua b/sudoku/boards.lua
similarity index 100%
rename from boards.lua
rename to sudoku/boards.lua
diff --git a/check.lua b/sudoku/check.lua
similarity index 100%
rename from check.lua
rename to sudoku/check.lua
diff --git a/sudoku.lua b/sudoku/sudoku.lua
similarity index 100%
rename from sudoku.lua
rename to sudoku/sudoku.lua
diff --git a/utils.lua b/sudoku/utils.lua
similarity index 100%
rename from utils.lua
rename to sudoku/utils.lua
diff --git a/ui/colors.lua b/ui/colors.lua
new file mode 100644
index 0000000..c41b7bf
--- /dev/null
+++ b/ui/colors.lua
@@ -0,0 +1,29 @@
+require "ui.globals"
+
+local cached_colors = {}
+function cHex(rgb)
+    if cached_colors[rgb] then return unpack(cached_colors[rgb]) end
+    r = tonumber(string.sub(rgb, 1, 2), 16) / 255
+    g = tonumber(string.sub(rgb, 3, 4), 16) / 255
+    b = tonumber(string.sub(rgb, 5, 6), 16) / 255
+    cached_colors[rgb] = {r, g, b}
+    return r, g, b
+end
+
+function setBackgroundColor(c)
+    love.graphics.setBackgroundColor(cHex(c))
+end
+
+function setColor(c)
+    love.graphics.setColor(cHex(c))
+end
+
+
+-- colors.smallNumbersDisabled = cHex("EEEEEE")
+-- colors.smallNumbersEnabled = cHex("0000FF")
+-- colors.boardCursor = cHex("0000FF")
+-- colors.backGround = cHex("FFFFFF")
+-- colors.messagesText = cHex("000000")
+-- colors.boardThinLines = cHex("808080")
+-- colors.boardThikLines = cHex("000000")
+
diff --git a/ui/config.lua b/ui/config.lua
new file mode 100644
index 0000000..8d94100
--- /dev/null
+++ b/ui/config.lua
@@ -0,0 +1,24 @@
+require "ui.globals"
+
+grid.x1 = 300
+grid.y1 = 150
+
+cell.width = 90
+cell.height = 90
+cell.mx = 10             -- margin x
+cell.my = 5              -- margin y
+
+fonts.bigNum = love.graphics.newFont(64)
+fonts.smallNum = love.graphics.newFont(24)
+fonts.info = love.graphics.newFont(24)
+
+colors.smallNumbersDisabled = "EEEEEE"
+colors.smallNumbersEnabled = "0000FF"
+colors.boardCursor = "0000FF"
+colors.backGround = "FFFFFF"
+colors.messagesText = "000000"
+colors.boardThinLines = "808080"
+colors.boardThikLines = "000000"
+
+cursor.x = 1
+cursor.y = 1
diff --git a/ui/draw.lua b/ui/draw.lua
new file mode 100644
index 0000000..d7cab1d
--- /dev/null
+++ b/ui/draw.lua
@@ -0,0 +1,51 @@
+require "ui.globals"
+require "ui.colors"
+
+function drawGrid()
+    love.graphics.setLineWidth(1)
+    setColor(colors.boardThinLines)
+    for i = 1, 6 do
+        love.graphics.line(grid.vline[i].x1, grid.vline[i].y1, grid.vline[i].x2, grid.vline[i].y2)
+        love.graphics.line(grid.hline[i].x1, grid.hline[i].y1, grid.hline[i].x2, grid.hline[i].y2)
+    end
+    love.graphics.setLineWidth(2)
+    setColor(colors.boardThikLines)
+    for i = 1, 4 do
+        love.graphics.line(grid.vbline[i].x1, grid.vbline[i].y1, grid.vbline[i].x2, grid.vbline[i].y2)
+        love.graphics.line(grid.hbline[i].x1, grid.hbline[i].y1, grid.hbline[i].x2, grid.hbline[i].y2)
+    end
+end
+
+function drawSmallNumbers()
+    love.graphics.setFont(fonts.smallNum)
+    for x = 1, 9 do
+        for y = 1, 9 do
+            for i = 1, 9 do
+                local x1 = smallNumbers[x][y][i].x
+                local y1 = smallNumbers[x][y][i].y
+                if smallNumbersVal[x][y][i] then
+                    setColor(colors.smallNumbersEnabled)
+                else
+                    setColor(colors.smallNumbersDisabled)
+                end
+                love.graphics.print(tostring(i), x1, y1)
+            end
+        end
+    end
+end
+
+function drawCursor()
+    setColor(colors.boardCursor)
+    local x = grid[cursor.x][cursor.y].x1
+    local y = grid[cursor.x][cursor.y].y1
+    love.graphics.setLineWidth(3)
+    love.graphics.rectangle("line", x+3, y+3, cell.width-6, cell.height-6, 10, 10)
+end
+
+function drawMessages()
+    setColor(colors.messagesText)
+    love.graphics.setFont(fonts.info)
+    for i, msg in ipairs(messages) do
+        love.graphics.print(msg, 25, 150 + 24 * (i-1))
+    end
+end
diff --git a/ui/globals.lua b/ui/globals.lua
new file mode 100644
index 0000000..b228e55
--- /dev/null
+++ b/ui/globals.lua
@@ -0,0 +1,9 @@
+grid = {}
+cell = {}
+fonts = {}
+colors = {}
+messages = {}
+cursor = {}
+
+smallNumbers = {}
+smallNumbersVal = {}
diff --git a/ui/init.lua b/ui/init.lua
new file mode 100644
index 0000000..cfc7876
--- /dev/null
+++ b/ui/init.lua
@@ -0,0 +1,71 @@
+function initSmallNumbers()
+    local dx = math.floor((cell.width - 2 * cell.mx) / 3) + 2
+    local dy = math.floor((cell.width - 2 * cell.my) / 3)
+    for x = 1, 9 do
+        smallNumbers[x] = {}
+        smallNumbersVal[x] = {}
+        for y = 1, 9 do
+            smallNumbers[x][y] = {}
+            smallNumbersVal[x][y] = {}
+            local x1 = grid.x1 + (x - 1) * cell.width
+            local y1 = grid.y1 + (y - 1) * cell.height
+            local n = 1
+            for j = 1, 3 do
+                for i = 1, 3 do
+                    local x2 = x1 + cell.mx + (i-1) * dx
+                    local y2 = y1 + cell.my + (j-1) * dy
+                    smallNumbers[x][y][n] = {x=x2, y=y2}
+                    smallNumbersVal[x][y][n] = false
+                    n = n + 1
+                end
+            end
+        end
+    end
+    smallNumbersVal[8][5][4] = true
+end
+
+function initGrid()
+    grid.x2 = grid.x1 + 9 * cell.width
+    grid.y2 = grid.y1 + 9 * cell.height
+    for i = 1, 9 do
+        grid[i] = {}
+        for j = 1, 9 do
+            local x = grid.x1 + (i - 1) * cell.width
+            local y = grid.y1 + (j - 1) * cell.height
+            grid[i][j] = {x1=x, y1=y, x2=x+cell.width, y2=y+cell.height}
+        end
+    end
+    local n = 0
+    local m = 0
+    grid.vline = {}
+    for x = grid.x1, grid.x1 + 9 * cell.width, cell.width do
+        n = n + 1
+        if n % 3 ~= 1 then
+            m = m + 1
+            grid.vline[m] = {x1=x, y1=grid.y1, x2=x, y2=grid.y1+9*cell.height}
+        end
+    end
+    n = 0
+    m = 0
+    grid.hline = {}
+    for y = grid.y1, grid.y1 + 9 * cell.height, cell.height do
+        n = n + 1
+        if n % 3 ~= 1 then
+            m = m + 1
+            grid.hline[m] = {x1=grid.x1, y1=y, x2=grid.x1+9*cell.width, y2=y}
+        end
+    end
+    n = 0
+    grid.vbline = {}
+    for x = grid.x1, grid.x1+9 * cell.width, cell.width * 3 do
+        n = n + 1
+        grid.vbline[n] = {x1=x, y1=grid.y1, x2=x, y2=grid.y1+9*cell.height}
+    end
+    n = 0
+    grid.hbline = {}
+    for y = grid.y1, grid.y1+9*cell.height, cell.height * 3 do
+        n = n + 1
+        grid.hbline[n] = {x1=grid.x1, y1=y, x2=grid.x1+9*cell.width, y2=y}
+    end
+end
+
diff --git a/ui/keyboard.lua b/ui/keyboard.lua
new file mode 100644
index 0000000..1f4251d
--- /dev/null
+++ b/ui/keyboard.lua
@@ -0,0 +1,40 @@
+function love.keypressed(key)
+    if key == "escape" or key == "q" then
+        love.event.quit()
+    elseif key == "right" or key == "l" then
+        cursor.x = cursor.x + 1
+        if cursor.x > 9 then cursor.x = 1 end
+    elseif key == "left" or key == "h" then
+        cursor.x = cursor.x - 1
+        if cursor.x < 1 then cursor.x = 9 end
+    elseif key == "down" or key == "j" then
+        cursor.y = cursor.y + 1
+        if cursor.y > 9 then cursor.y = 1 end
+    elseif key == "up" or key == "k" then
+        cursor.y = cursor.y - 1
+        if cursor.y < 1 then cursor.y = 9 end
+    -- elseif key == "n" then
+    --     cursor.x = cursor.x - 1
+    --     if cursor.x < 1 then cursor.x = 9 end
+    --     cursor.y = cursor.y + 1
+    --     if cursor.y > 9 then cursor.y = 1 end
+    elseif key == "1" then
+        smallNumbersVal[cursor.x][cursor.y][1] = not smallNumbersVal[cursor.x][cursor.y][1]
+    elseif key == "2" then
+        smallNumbersVal[cursor.x][cursor.y][2] = not smallNumbersVal[cursor.x][cursor.y][2]
+    elseif key == "3" then
+        smallNumbersVal[cursor.x][cursor.y][3] = not smallNumbersVal[cursor.x][cursor.y][3]
+    elseif key == "4" then
+        smallNumbersVal[cursor.x][cursor.y][4] = not smallNumbersVal[cursor.x][cursor.y][4]
+    elseif key == "5" then
+        smallNumbersVal[cursor.x][cursor.y][5] = not smallNumbersVal[cursor.x][cursor.y][5]
+    elseif key == "6" then
+        smallNumbersVal[cursor.x][cursor.y][6] = not smallNumbersVal[cursor.x][cursor.y][6]
+    elseif key == "7" then
+        smallNumbersVal[cursor.x][cursor.y][7] = not smallNumbersVal[cursor.x][cursor.y][7]
+    elseif key == "8" then
+        smallNumbersVal[cursor.x][cursor.y][8] = not smallNumbersVal[cursor.x][cursor.y][8]
+    elseif key == "9" then
+        smallNumbersVal[cursor.x][cursor.y][9] = not smallNumbersVal[cursor.x][cursor.y][9]
+    end
+end
diff --git a/ui/mouse.lua b/ui/mouse.lua
new file mode 100644
index 0000000..3f04989
--- /dev/null
+++ b/ui/mouse.lua
@@ -0,0 +1,29 @@
+function love.mousepressed(x, y, button, istouch)
+    local inBoard = false
+    local dx = math.floor(cell.width / 3)
+    local dy = math.floor(cell.height / 3)
+    local cx = 0
+    local cy = 0
+    local mx = 0
+    local my = 0
+    local n = 0
+    if x > grid.x1 and x < grid.x2 and y > grid.y1 and y < grid.y2 then
+        inBoard = true
+        cx = math.floor((x - grid.x1) / cell.width) + 1
+        cy = math.floor((y - grid.y1) / cell.height) + 1
+        mx = math.floor((x - grid[cx][cy].x1) / dx) + 1
+        my = math.floor((y - grid[cx][cy].y1) / dy) + 1
+        n = mx + 3 * (my - 1)
+    end
+    if button == 1 then
+        if cursor.x == cx and cursor.y == cy then
+            smallNumbersVal[cx][cy][n] = not smallNumbersVal[cx][cy][n]
+        else
+            cursor.x = cx
+            cursor.y = cy
+        end
+    elseif button == 2 then
+        smallNumbersVal[cx][cy][n] = not smallNumbersVal[cx][cy][n]
+    end
+end
+