Tetris DX reiterates the most addicting game by adding a save feature, new music, and some additional game modes.
Five unused songs can be accessed via Game Genie code ??4-5CB-E6F (where "??" is one of the below), replacing the first main menu screen's music.
ID: 4A "The March of the Toreadors" from the original Game Boy game! Tetris DX may have had a D-TYPE music setting planned at some point during development, possibly replacing the OFF setting. It could have been scrapped for time, or simply because Tetris originally had three songs. Remains a mystery either way.
Game Genie codes 3DD-01B-3B6 4BC-2CB-913 4CC-31B-917 will replace the in-game A-TYPE music.
ID: 4B Unused critical music. Game Genie codes 3ED-01B-3B6 4BC-2CB-913 4BC-31B-917 will replace the in-game A-TYPE music.
ID: 64 The full Korobeiniki theme. Unlike the four-second jingle heard during the rocket cutscene featuring a dancing Statue of Liberty (ID: A9), this version is never heard. Game Genie codes 57D-01B-3B6 64C-2CB-913 64C-31B-917 will replace the in-game A-TYPE music.
ID: CB Possibly intended for a credits theme. Game Genie codes BED-01B-3B6 CBC-2CB-913 CBC-31B-917 will replace the in-game A-TYPE music.
ID: 63 Quick looping song. Likely used for testing purposes. Game Genie codes 56D-01B-3B6 63C-2CB-913 63C-31B-917 will replace the in-game A-TYPE music.
Super Game Boy 1 and 2 Borders
|Super Game Boy||Super Game Boy 2|
When Tetris DX is played through Super Game Boy 2, a different border is displayed than when it is played through the original Super Game Boy. This said, the "2" border can be accessed in the original by putting Tetris DX into a Game Genie into the Super Game Boy, as the Super Game Boy 2 verifies whether the internal accumulator value is FE during bootup to determine whether it is Super Game Boy 2.
The Game Genie boot ROM bypasses the internal accumulator telling the game to load the Super Game Boy 2 features.
There are a couple of unused graphics and a ton of placeholders loaded at the title, so there may have been further plans for the title screen.
The early idea to display Tetris DX in Japanese is the only remnant left. This appears to have been placed over the placeholder tiles, because there are still remaining pieces.
This copyright string was likely going to be placed below the "ENTRY" option on the title screen.
There is code that constantly swaps the letters MUSIC when selecting a mode. These letters were likely supposed to have shadowing effects as with the BGM TYPE letters.
Connection with Game Boy Color Promotional Demo
Not only was the promotional cartridge an excessive hack of Wario Land II, but it also features code from Tetris DX, most notably the fish pond, "flying triangles" Nintendo logos, and chalkboard. GameShark code 01??02C1 will show these attraction demos when playing Tetris DX on a Game Boy or Super Game Boy:
- ID: 01 - Fish pond
- ID: 03 - "Flying triangles" Nintendo logo #1
- ID: 05 - Chalkboard
- ID: 07 - "Flying triangles" Nintendo logo #2
|GBC Promotional Demo||Tetris DX|
The words "Now in" were removed from the blackboard.