[Kong]

Game Genie codes work at RU only in NES Full Mode - Not Genesis.

Debug mode and other Sonic cheats add numbers to the top of the screen which would be obvious in the score screen shot.

You get 50,000 points for finishing a level in under 30 seconds.

You get bonus points for combos - killing multiple enemies with one roll.

You get bonus points for destroying multiple blocks at once. You can get up to 30,000 points for this in Act 2 of the Marble Zone.

There are multiple invisible bonus icons near the turnstiles. Worth 100 to 10,000 points each.

There is a way to farm in Zone 1 Act 3. I won't say what it is.