diff --git a/input.lua b/input.lua
new file mode 100644
index 0000000..1708e1f
--- /dev/null
+++ b/input.lua
@@ -0,0 +1,98 @@
+-- Input system
+-- TODO: replace this with universal system
+local Input = {
+    keyboardButtons = { '1', '2', '3', '4', 'r' },
+    keyboardPressed = {},
+    lastKeyboardPressed = {},
+    actions = {}
+}
+
+local function mapAction( input, action, keys )
+    input.actions[action] = {}
+    for _, key in pairs( keys ) do
+        table.insert( input.actions[action], key )
+    end
+end
+
+local function loadMap( input )
+    mapAction( input, 'first', { '1' } )
+    mapAction( input, 'second', { '2' } )
+    mapAction( input, 'third', { '3' } )
+    mapAction( input, 'none', { '4' } )
+    mapAction( input, 'rotate', { 'r' } )
+end
+
+local function predHolded( pressed, _ )
+    return pressed
+end
+
+local function predPressed( pressed, lastPressed )
+    return pressed and not lastPressed
+end
+
+local function predReleased( pressed, lastPressed )
+    return not pressed and lastPressed
+end
+
+local function testAction( input, action, predicate )
+    for _, key in ipairs( input.actions[action] ) do
+        local pressed, lastPressed
+
+        pressed = input.keyboardPressed
+        lastPressed = input.lastKeyboardPressed
+
+        if predicate( pressed[key], lastPressed[key] ) then
+            return true
+        end
+    end
+
+    return false
+end
+
+function Input.init()
+    for btn in ipairs( Input.keyboardButtons ) do
+        Input.keyboardPressed[Input.keyboardButtons[btn]] = false
+        Input.lastKeyboardPressed[Input.keyboardButtons[btn]] = false
+    end
+
+    loadMap( Input )
+
+    return Input
+end
+
+function Input:update()
+    for k, _ in pairs( self.keyboardPressed ) do
+            self.lastKeyboardPressed[k] = self.keyboardPressed[k]
+    end
+
+    for button in ipairs( self.keyboardButtons ) do
+            self.keyboardPressed[self.keyboardButtons[button]] = love.keyboard.isDown( self.keyboardButtons[button] )
+    end
+end
+
+function Input:actionHolded( action )
+    return testAction( self, action, predHolded )
+end
+
+function Input:actionReleased( action )
+    return testAction( self, action, predReleased )
+end
+
+function Input:actionPressed( action )
+    return testAction( self, action, predPressed )
+end
+
+function Input:actionDiff( negative, positive )
+    local negResult = testAction( self, negative, predHolded )
+    local posResult = testAction( self, positive, predHolded )
+
+    if negResult and not posResult then
+        return -1
+    elseif posResult and not negResult then
+        return 1
+    else
+        return 0
+    end
+end
+
+return Input.init()
diff --git a/main.lua b/main.lua
index 6e60897..8316543 100644
--- a/main.lua
+++ b/main.lua
@@ -4,48 +4,53 @@ require 'mouse'
 require 'mechanism'
 require 'port'
 require 'tablefuncs'
+Input = require 'input'
+require 'selector'
 
 function love.load()
     Screenw, Screenh = love.window.getMode()
     Gridw, Gridh = Screenw / Config.cellSize, Screenh / Config.cellSize
-    local port1 = Port:new( GridPoint:new(-1, 0), PortRotation.left, { 0.8, 0.8, 0, 1 } )
-    local port2 = Port:new( GridPoint:new(0, -1), PortRotation.up, { 0.8, 0, 0.8, 1 } )
-    local port3 = Port:new( GridPoint:new(3, 2), PortRotation.right, { 0.8, 0, 0, 1 } )
-    local port4 = Port:new( GridPoint:new(2, 3), PortRotation.down, { 0, 0, 0.8, 1 } )
-    local mecha1 = Mechanism:new( GridPoint:new(5, 5), GridPoint:new(3, 3), { port1, port2, port3, port4 }, {0.5, 0.5, 0.5, 1} )
+    Mechs = {}
 
-    local port5 = Port:new( GridPoint:new(-1, 0), PortRotation.left, { 0.8, 0.8, 0, 1 } )
-    local port6 = Port:new( GridPoint:new(0, -1), PortRotation.up, { 0.8, 0, 0.8, 1 } )
-    local port7 = Port:new( GridPoint:new(2, 1), PortRotation.right, { 0.8, 0, 0, 1 } )
-    local port8 = Port:new( GridPoint:new(1, 2), PortRotation.down, { 0, 0, 0.8, 1 } )
-    local mecha2 = Mechanism:new( GridPoint:new(10, 5), GridPoint:new(2, 2), { port5, port6, port7, port8 }, {0.5, 1, 0.5, 1} )
-
-    local port9 = Port:new( GridPoint:new(-1, 0), PortRotation.left, { 0.8, 0.8, 0, 1 } )
-    local port10 = Port:new( GridPoint:new(0, -1), PortRotation.up, { 0.8, 0, 0.8, 1 } )
-    local port11 = Port:new( GridPoint:new(2, 0), PortRotation.right, { 0.8, 0, 0, 1 } )
-    local port12 = Port:new( GridPoint:new(1, 1), PortRotation.down, { 0, 0, 0.8, 1 } )
-    local mecha3 = Mechanism:new( GridPoint:new(13, 5), GridPoint:new(2, 1), { port9, port10, port11, port12 }, {1, 0.5, 0.5, 1} )
-
-    local port13 = Port:new( GridPoint:new(-1, 0), PortRotation.left, { 0.8, 0.8, 0, 1 } )
-    local port14 = Port:new( GridPoint:new(0, -1), PortRotation.up, { 0.8, 0, 0.8, 1 } )
-    local port15 = Port:new( GridPoint:new(2, 0), PortRotation.right, { 0.8, 0, 0, 1 } )
-    local port16 = Port:new( GridPoint:new(1, 1), PortRotation.down, { 0, 0, 0.8, 1 } )
-    local mecha4 = Mechanism:new( GridPoint:new(16, 5), GridPoint:new(2, 1), { port13, port14, port15, port16 }, {0.5, 0.5, 1, 1} )
-    Mechs = {mecha1, mecha2, mecha3, mecha4}
+    Selected = nil
 end
 
 function love.update( dt )
     dt = dt
-    Mouse:update()
 
-    if Mouse.lastPressed and not Mouse.pressed then
-        local index = TableFind(Mechs, Mouse.point, function(mp, mech)
-            return mp.x >= mech.position.x and mp.x < mech.position.x + mech.size.x and
-                mp.y >= mech.position.y and mp.y < mech.position.y + mech.size.y
+    Mouse:update()
+    Input:update()
+    selectorUpdate()
+
+    Selected = getSelected()
+
+    if Selected ~= nil then
+        Selected.position = Mouse.point
+        if Mouse.lastPressed and not Mouse.pressed then
+            local intersects = TableHas( Mechs, Selected, function(this, other)
+                return this:intersectsOther( other )
+            end
+            )
+            if not intersects then
+                local mech = Selected:clone()
+                mech.position = GridPoint:new( Mouse.point.x, Mouse.point.y )
+                mech.xcorner = GridPoint:new( Selected.xcorner.x, Selected.xcorner.y )
+                table.insert( Mechs, mech )
+            end
         end
-        )
-        if index ~= nil then
-            Mechs[index]:rotateClockwise()
+    end
+
+    if Input:actionReleased( 'rotate' ) then
+        if Selected ~= nil then
+            Selected:rotateClockwise()
+        else
+            local index = TableFind(Mechs, Mouse.point, function(mp, mech)
+                return mech:intersectsPoint( mp )
+            end
+            )
+            if index ~= nil then
+                Mechs[index]:rotateClockwise()
+            end
         end
     end
 end
@@ -67,4 +72,8 @@ function love.draw()
     for _, mech in ipairs(Mechs) do
         mech:draw()
     end
+
+    if Selected ~= nil then
+        Selected:draw()
+    end
 end
diff --git a/mechanism.lua b/mechanism.lua
index 01f755b..ec0d730 100644
--- a/mechanism.lua
+++ b/mechanism.lua
@@ -55,6 +55,7 @@ function Mechanism:new( position, size, ports, color )
     return mechanism
 end
 
+---@return Mechanism
 function Mechanism:clone()
     local ports = {}
     for _, port in ipairs(self.ports) do
@@ -67,6 +68,25 @@ function Mechanism:clone()
         ports = ports,
         color = self.color
     }
+    setmetatable( mechanism, { __index = self } )
+
+    return mechanism
+end
+
+function Mechanism:intersectsPoint( point )
+    return point.x >= self.position.x and
+        point.x < self.position.x + self.size.x and
+        point.y >= self.position.y and
+        point.y < self.position.y + self.size.y
+end
+
+function Mechanism:intersectsOther( mechanism )
+    return mechanism.position.x + mechanism.size.x > self.position.x and
+        mechanism.position.x <
+        self.position.x + self.size.x and
+        mechanism.position.y  + mechanism.size.y > self.position.y and
+        mechanism.position.y < self.position.y + self.size.y
+
 end
 
 function Mechanism:rotateClockwise()
diff --git a/selector.lua b/selector.lua
new file mode 100644
index 0000000..e55713c
--- /dev/null
+++ b/selector.lua
@@ -0,0 +1,35 @@
+local port1 = Port:new( GridPoint:new(-1, 0), PortRotation.left, { 0.8, 0.8, 0, 1 } )
+local port2 = Port:new( GridPoint:new(0, -1), PortRotation.up, { 0.8, 0, 0.8, 1 } )
+local port3 = Port:new( GridPoint:new(3, 2), PortRotation.right, { 0.8, 0, 0, 1 } )
+local port4 = Port:new( GridPoint:new(2, 3), PortRotation.down, { 0, 0, 0.8, 1 } )
+local port5 = Port:new( GridPoint:new(2, 0), PortRotation.right, {0.8, 0.8, 0, 1} )
+local port6 = Port:new( GridPoint:new(0, 2), PortRotation.down, { 0.8, 0.4, 0.4, 1 } )
+
+local mecha1 = Mechanism:new( GridPoint:new(5, 5), GridPoint:new(3, 3), { port1:clone(), port2:clone(), port3:clone(), port4:clone() }, {0.5, 0.5, 0.5, 1} )
+
+local mecha2 = Mechanism:new( GridPoint:new(10, 5), GridPoint:new(2, 2), { port1:clone(), port2:clone(), port5:clone(), port6:clone() }, {0.5, 1, 0.5, 1} )
+
+local mecha3 = Mechanism:new( GridPoint:new(13, 5), GridPoint:new(2, 1), { port1:clone(), port2:clone(), port5:clone() }, {1, 0.5, 0.5, 1} )
+
+local mechs = { mecha1, mecha2, mecha3 }
+local actions = { 'none', 'first', 'second', 'third' }
+
+local selected = 0
+
+function selectorUpdate()
+    for index, action in ipairs(actions) do
+        if Input:actionReleased(action) then
+            selected = index - 1
+            break
+        end
+    end
+end
+
+---@return Mechanism|nil
+function getSelected()
+    if selected > 0 then
+        return mechs[selected]
+    else
+        return nil
+    end
+end