Sintax Platformer Engine

A more simplified Game Boy Advance version of Digimon Adventure exists in ROM form, although no cartridge is known to exist and it exhibits several game-breaking bugs, so it may in fact be an engine tech demo.

Whether this port was released or not, Sintax would go on to release a series of GBA titles using the same engine, including Rayman 4 and Crash Advance IV. The released games fix many of the bugs found in the engine, and generally feature the same set of levels reordered.

Currently, only Digimon Adventure was founded & dumped and it may become the only way to play Sintax Platformer Engine.

Digimon Adventure
It has all the stages and bosses from the SNES version (in a different order), but cannot be completed ordinarily without hacking because the bosses take no damage and eventually disappear, leaving it impossible for the player to go any further and beat the game. Also unlike the SNES version, the player don't transform into Greymon after collecting a strawberry, although a view inside of the ROM's graphics show that the transformation graphics are in there.
 * GBA stage 1 = SNES stage 4
 * GBA stage 2 = SNES stage 1
 * GBA boss 1 = SNES boss 2
 * GBA stage 3 = SNES stage 2
 * GBA stage 4 = SNES stage 3
 * GBA boss 2 = SNES boss 1

Trivia

 * The snow-based level appears to be exactly the same as the one in Mulan for Mega Drive, which in turn was stolen from Beauty and the Beast: Roar of the Beast.
 * Leftover graphics of the intro of A Bug's Life can be found in the SNES ROM. These same leftovers also appear in the same location towards the end of the ROM in Pokémon Gold Silver, suggesting they both were possibly developed side by side and based on A Bug's Life's engine.

Crash Advance IV
Crash Advance IV is a pirate game for the Game Boy Advance. It is based off of Sintax Platformer Engine, and as such, it has the same bugs/glitches that the others do.

The game is undumped, and sometimes does not even work on original hardware due to problems with encryption. It is notable for having been described on the Crash Mania forums in 2006, 9 years before any footage or other information was available for it, in a way that became a running joke on that forum.

Sonic 3 Fighter Sonic
Sonic 3: Fighter Sonic (also known as Fighter Sonic) is a pirate game for the Game Boy Advance. It uses Sintax Platformer Engine. The game is currently undumped.

Overview
As stated, this game uses the same engine as a string of other GBA platform games likely made by Sintax. You can move left, right, and jump. In this game, your projectile attack is throwing "spin dashes" at the opponent. The game's engine suffers from a number of bugs, particularly with the audio.

Most, if not all of Sonic 3 Fighter Sonic's sprites are ripped from the Sonic Advance series. Notably, Sonic's life icon is his Sonic Advance 2 life icon, but with sunglasses. The graphics for Sonic and all of the objects seem to be taken from Sonic Advance and Sonic Advance 2 but with less animation frames. Oddly, the sound when collecting rings was stolen from Pokémon Red and Blue. The game has a total of 4 levels; there are rings throughout said levels, but they seem to have no purpose other than increasing the score. Rather bizarrely, Sonic does not lose rings when hit, and instead has a health meter. The game includes a score counter which is increased in various ways.

Unlike other Sonic games, SONIC HAS NO SPEED

mARIO dx (MARIO HASN'T ESCAPED FROM SINTAXED LOL)
Not to be confused with the official Nintendo title Super Mario Bros. Deluxe. Super Mario DX (马里奥DX) is an unlicensed game for the Game Boy Advance. It is made by Sintax and uses Sintax Platformer Engine.

The gameplay is identical to Sintax's other GBA platformers and because of that, It doesn't play like a traditional Mario game. You control Mario through 6 levels, collecting coins and fruit. you can attack enemies by jumping on them or shooting fireballs at them without a fire flower.

A majority of the graphics are taken from Super Mario World: Super Mario Advance 2 and Yoshi's Island: Super Mario Advance 3.

Donkey Kong 2
Not to be confused with the official Nintendo title Donkey Kong Jr. or Donkey Kong Country 2. Donkey Kong 2 (驴子2) is a pirate game made for the Game Boy Advance, and was made by Sintax. The game uses Sintax Platformer Engine. Due to this, this game games shares a good amount of its glitches with these games, mainly having to do with the audio. The gameplay consists of the player controlling Donkey Kong, throwing an unlimited amount of barrels at enemies.

Trivia

 * Unlike many games using the Sintax engine, this game has a pause menu.
 * The game over screen in this game doesn't work properly; instead of going back to the title screen, the game simply crashes.
 * Though you play as Donkey Kong, he wears a red hat much like his nephew from the Donkey Kong Country series, Diddy Kong.

Harry Potter IV
Harry Potter IV is a pirate game made for the Game Boy Advance, and it was developed by Sintax. This game uses Sintax Platformer Engine, and as such, it plays the same, and has the same amount of glitches (particularly the audio).

List of other games using Sintax Platformer Engine that hasn't have an article on BootlegGames Wiki

 * Teenage Mutant Ninja Turtles 2 [E12-U2]
 * Crash Bandicoot 3 - Warped https://www.youtube.com/watch?v=OwJEK7d4O3I
 * Rayman IV [E12-U13 English, R12-U14 Russian] ['Sunshine of trip' in English release, 'Der Sonneschein auf der Reise' in German release.]
 * 'Путешествие солнечного света' in Russian release] https://www.youtube.com/watch?v=FzYi_4zHF3w
 * Spider Man 3
 * Lord of the Rings IV [E12-U15] https://www.youtube.com/watch?v=Fddu8kHo6G4
 * Aladdin 2 [Not on cartridge label, E12-U10] http://s4.zetaboards.com/PGC_Forums/topic/10211768/1/
 * Ultraman - Confrontation Between Justice And Evil [E12-U18] https://www.youtube.com/watch?v=cMWkT8N0csw
 * X-Man - Armour of Might [E12-U20] https://www.youtube.com/watch?v=_7mpmEIafn0