All levels unlocked.
Daniel Haslop's puzzle platformer, Leave Me a Clone, will give you quite a challenge through all 35 levels. Play as the cute little yellow alien who just wants to get through the next portal. Create clones of yourself to act as stepping stones (and any other use you can find for them) toward your final goal. And if you happen to earn stars along the way by collecting all the energy orbs or limiting your clone use, all the better!