found this online today: http://xyzzy.freeshell.org/consoles/tetris/tetris.txt holy crap that is a slew of game genie codes, many of which i have never seen. looks fun!
B-Type win animations. We probably haven't watched most of them, but some have various animals and aircraft (like the "Good" blimp, haha).
Tried a few of those; haven't found a useful one yet. Here's a list I found online. It's probably here somewhere already, but pasting if not: ENEOOGEZ - No score cap ZESAKPAE - DAS always charged IEKEOPAO - Faster auto-shift, three frames per second TEKEOPAO - Faster auto-shift, four frames per second YEKEOPAO - Faster auto-shift, five frames per second SXKAKPVT - No auto-shift, must tap to move GEKEEPAO AEKESOZE - PAL auto-shifting NYSPEZLE - Skip rocket sequence OPSPEZLE - Only get the rocket sequence if you max-out the score GPVEPKZA - A+Start = begin an additional 10 levels higher (20 levels higher) ZAUAPPPA - Forces game into 2-player mode XZNASPVZ LPNAVPGG - Forces the pieces to drop at Level 19 speeds ZEEEVPAL PEEENOLZ - Level 29 trainer (Start on Level 00 with 28 speed, go to Level 29 speed when you advance to Level 01) LANAKPPA ZPNEEEOIP EPNEOPEL - Pieces fall at Level 18 speed until Level 19 APSEGYIZ - 10 Lines for "Success" on b-type AISEGYIZ - 50 Lines for "Success" on b-type EASEGYIZ - 80 Lines for "Success" on b-type TOUZYLTO - Still show screen when paused TVLOVA - Every piece above level 9 has a delay at the top OKEAKPAO - Pieces don't fall at all, unless you press down PASAUPPE - Super fast down press SXVPKASA - Play a game were you get only the same piece VUKEILXX - Split screen 2 player mode ENEALYNN - Controller 1 controls flip, Controller 2 controller controls left/right PAKVLZAA SYSTAXKP - Unused/hidden music SXNEUOSE - Disable shift piece left sound SXVAVOSE - Disable shift piece right sound SXKEOESE - Disable rotate piece clockwise sound SXVAUESE - Disable rotate piece counter-clockwise sound SXNONXSE - Disable piece lock sound PGNAVPGG PANEEOIP ZEEEVPAU - Makes pieces fall similar to how they fall on SNES levels 29-31 OXYOUO VNIPZN VNTPYN - Invisible Tetris PENPAYGA AENOAYIA - All lines clear instantly TPNPGVYL - No flash on Tetrises GAOPEILA GGOPSZEN YGOPVZAL XPOPNZSX - Never die (Press Start on top-out to reset board) SXVOKLAP - Game transitions every 10 lines regardless of starting level EYTZAG - Press Start to skip copyright screen straight away EYTZAG PALEGZ - Auto-skip copyright screen SGSVSKNY XYSVVKNY - Add a basic drum line to Music C ATEEXZSZ - Pieces are invisible until they hit the stack IZVOXAIA TZVOUALP - Replaces level 7 colors with a pink and orange palette LPVOUALO GPVOXAIE - Replaces level 7 colors with a blue and green palette IPVOXAIA - Changes level 7 red to a pink (to fix the palette in only one code if you need the other two) LANAKPPA ZPNEEOIP - Speed never increases past 18 speed regardless of level ZANAKPPA - No killscreen, level 29+ continues on 19 speed XVVOVLVV - Disables level transitions PAZPUT - A+B+Start+Select returns to title screen (PAZOOT for PAL) LAZPUT - A+B+Start+Select returns to level select (LAZOOT for PAL) VNUASASL VNSAEASL - Tetris Mind Meld (P1 controls movement, P2 controls rotation) TAOPOPYA APOPXPEY - Much fewer longbars TAXOUPYA TAUPEPYA - When added to prev. two, no longbars. AAXOXGGA AEOOUGGA - Score does not show during the game AEOOUGGA - Score does not update during game until pushdown points are scored VLEAKAYO - Turn B-Type into cheese race (1 hole per layer)