This one was made a long time ago. It has many aspects to it, in terms of genres. Yet, there is only one general theme.

TD: Easy
LD: Medium-Hard

This was an idea I had relatively recently. It's very much a puzzle, but it also relies heavily on random chance. I suggest you think this one out on paper.

TD: Easy
LD: Hard

IMPORTANT NOTE: This level has been updated since its release. It is no longer beatable in 22 seconds. Highscore data for this level is also incorrect. (This will hopefully get fixed.)

Small but mighty! Underworld is challenging because of the delicacy of the situation: You often need to do EXACTLY the correct thing in order to win. The more you play, though, the more you'll get an idea of what to do.

TD: Easy-Medium
LD: Hard

Lynx version

IMPORTANT NOTE: Level has been fixed.

Like Joyride, but the obstacles are invisible! At least you can die more than once ;)

TD: Hard
LD: Easy

IMPORTANT NOTE: Level has been fixed.

A chaotic level. Use the ants to your advantage!

TD: Medium
LD: Medium

What??

TD: ??
LD: ??