This is an interesting flash game. Essentially your goal is to defend against intruders, and you have to kill all creeps before they reach the end of maze. At the beginning of each level, you can buy or sell weapons before you click "Start".
- Space or 'h': toggle enemy health bar
- 's': sell selected unit
- Fast level: 6, 13, 19, 26, 32
- Air level: 8, 17, 27
- Immune level: 10, 21, 32
- Boss level: 11, 22, 33
- Wood: every 7 levels