Flintstones

Flintstones

Stage select:
Hold A + B + C + Left and press Start at the title screen. Use the D-pad to select a starting stage.

Invincibility:
Hold A + B + C + Up and press Start at the title screen.

Unlimited energy:
Press Up, Down, Up(2), Down, Up, Right, A at the title screen, then press Start to begin game play.

Unlimited continues:
Hold Right and press Start at the title screen.

Additional stages:
If you select the Easy difficulty setting at the "Option" menu, you can only play until stage 4. However, if you select the Normal or Hard difficulties, you can play until stage 6, or the same last stage and view the ending.