Megaman 64

This game another title is Rockman Dash.

Infinite money
Go to market and kick the yellow can into the bakery behind the counter.
You will receive 1000 Zenny. Enter any shop and exit. The can should be
reappear. Repeat the process as many times you want.

Unlock bonus parts (jet skates and buster max):
Finish the game in hard mode less than 8 hours

Unlock hard mode
Finish the game once.

Unlock easy mode:
Finish the game in hard mode