Altered Space is an isometric puzzle / platforming game for the Gameboy. This run improves on the previous publication with slightly better optimization, as well as taking advantage of the odd way the game processes input. It is ~2 seconds faster then the current publication when accounting for the BIOS.
On menu screens, the game checks when you release a button to clear the menu, as opposed to most games that look for a button press. Recognizing this accounts for about half the savings in the run, as there are a lot of extra frames of held input in the original.
The other time save is taking advantage of screen transitions. The game will register your input just before leaving one room and apply it at the start of the next room. This is actually used in the original run, but only in a single instance. This run uses it much more extensively.
Altered Space is also pretty infamous among Gameboy emulator authors as it encounters the STAT IRQ bug on the intro cutscene. Of course now this bug is well understood (and the run skips the intro cutscene anyway.)
This run is also console verified.
feos: Claiming for judging.
feos: Accepting over [3058] GB Altered Space: A 3-D Alien Adventure by ventuz in 03:24.26. It looks longer, but gameplay is 2 seconds shorter now.
fsvgm777: Processing.