Here are some cheats and tips for the game Wario Land: Super Mario Land 3.
Locate hidden treasures:
After completing the game without the best ending ($99,999),
start the game again and enter the flashing Saved Game pipe. Levels
with unclaimed hidden treasures will be marked with flashing dots
on the level circles.
Cheat mode:
Press Start to pause game play, then press Select(16).
A cursor will appear on the status line. Hold A + B
and press Left or Right to move the cursor. Press
Up or Down to change the number of current coins,
lives, hearts, or time. Move the cursor on the small Wario head
and press Up to change Wario into the next powered-up version
(Small, Hard Hat, Bull, Jet, Dragon).