In each level, your goal is to guide a herd of lemons from the entrance door to the exit door. The average lemon is not very clever, and will need assistance along the way.

- A lemon will turn and walk the other way if it encounters an obstacle.
- Because they are stupid pieces of fruit who don't know any better, lemons walk off of the edges of platforms, even when there's nothing to land on.
- Lemons will die if they fall into water, lava, or slime.

Lemons aren't entirely hopeless. Though their long-term memory is poor they are able to acquire new skills and remember them for brief periods. You can teach a lemon to bash or dig through blocks, climb over certain obstacles, build staircases, block other lemons from following a path, or even to explode and cause damage to their surroundings.

To teach a lemon new tricks, use your arrow or number keys to hover the cursor over a lemon, then enter the letter which corresponds with the skill you wish to assign (as shown in the status-bar during gameplay.)

To pass each level, you must guide at least 50% of the lemons to the exit before time runs out. If all hope is lost, you can always hit N to nuke any lemons remaining on the screen.