Complete a stage without being hurt by an enemy to earn 5000 bonus points.
5000 Bonus Points
Complete any level without collecting any special items to get 5000 bonus points.
Last boss warp
At the end of Blue lake woods there is a series of blocks just above the flag. Jump to the last one and then press down and right, jump and special together. You will be warped to Plethora, the last level.