Flightless, an adventure game on www.flash-game.net will bring you a great fun. Try to collect all the 50 gems in different spaces. Use arrow keys to move, hit Space bar to build an upward ladder and click the Down key and space bar to build a downward ladder. You can also kill those dangerous bats with your ladders. Figure out how to reach the exit to enter another space. The map on the top left corner will help you make clear your position. Good luck!