In the first level of redwood forest (the level after the first boss), climb the tree where the bird is dropping eggcorns. At the top there is a knife. Get the knife, go down the tree and cut the brige. Fall down and go right. After you beat the level in the play area you will see a question mark. Enter it to play in Bunny Land.
Exit level
When you are in a level and want to leave but you're stuck or can't find the exit, hit start then press A B and C at the same time and you will exit the level.
Final boss tip
If you stand to the far right of the screen when the Final Boss shoots his lasers, he can't hit you.
Level passwords
All but 4 levels completed (including lighthouse): 040 277 404 304 304 567 073 717 514
All levels open: 600 276 007 314 325 663 037 356 576