The Flintstones: King Rock Treasure Island

This Flintstone-themed Game Boy game is actually pretty decent. You should play it.

Title Screen Button Sequences
Two cheat codes can be entered at the title screen, but only one was enabled at the time the final game was built.

Hidden Minigame


At the title screen, when the "PUSH START" message appears, press Select, B, A, A, B, Select, B, A. A sound will confirm correct code entry. Now press Start to begin a mini-game, similar to the Game & Watch Helmet: use Left/Right to move Fred, the goal being to reach the right side of the screen as many times as you can under the rain of rocks.

Inverted Flintstones


Game Genie code will enable a different button sequence and disable the minigame: at the title screen, press Down, Down, Down, Down, Up, Up, Up, Up. A sound will confirm correct code entry and the whole game can be played with inverted colors.

Debug Menu


Apply the above patch to a US v1.0 ROM, then press Select on the title screen.

You can choose which stage (ROUND) to start at, how many lives (STOCK) you have, and whether or not enemies can hurt you (NOHIT; toggles bit 1). SOUND will play one of sound effects/background music tunes. The purpose of SCREEN is unknown (toggles bit 2, which is never read). Press Start to start the game exit, when the EXIT option is selected.

There is a bug in the code where, while using Select here will change the selected main option, the first three options also accept pressing that button as valid input to increment their respective value. As such, it's probably best if you don't use Select here.

Debug Tileset


Present at in the US v1.0 ROM is a peculiar tileset depicting various arrows, slopes, cursors, icons, flag poles, etc. This looks to be a remnant of a map viewer, if not editor. Icons for various items such as hearts and pickups (Dino, Gazoo) exist as selected and unselected as well.

There are no references to this tileset in the ROM, even though it uses a considerable amount of space and there is virtually no free space elsewhere in the ROM.

Alternate Copyrights


Game Genie code will display an alternate Taito copyright on the title screen.

Unused License Message


There is also another license message written to the window, but it never appears on the title screen. It may have been intended for a scrolling effect on the title screen.