Submission #7520: KiwiCracker & ShesChardcore's A2600 Space Invaders in 00:15.92

(Link to video)
Console Atari 2600 Emulator BizHawk 2.8
Game Version USA Frame Count 954
ROM Filename Space Invaders (USA).a26 Frame Rate 59.9227510135505
Branch Rerecord Count 4939
PowerOn Authors KiwiCracker, ShesChardcore
Game Space Invaders
Submitted by KiwiCracker on 6/2/2022 7:42:41 PM

Submission Comments



By using a not before featured technique, the previous record gets improved by 34 frames.

Game Objective

  • Beat the first stage of the game
  • Aims for earliest input end


The new technique is an easily executable horizontal size-change of the player (="cannon"). It is done by toggling the difficulty-switch.
A short explanation (citation) from a forum post which i wrote in december of last year:
[The size-change] alone probably wouldn't change much for us [...], but the important part is, that the cannon isn't centered at the middle (where the lazer-shots come from), but at the very left of the sprite, thus pushing the lazer-shot-origin slightly to the right when expanding - which turns out to be very powerfull :)

Possible Improvements

Finding out (mathematically) which order of shooting the invaders (within one column / within two columns / all together) is optimal will probably help (i haven't done it). This seems rather hard, as the timing (bullet fired until invader killed) changes as the invaders come further down to the ground, so one has to account for all different kinds of scenarios. I thing bruteforcing through a simulation of the game (similar to what chef stef did in [3943]NES Arkanoid "warpless" by Chef Stef in 11:11.18) might do the trick (more easily).

slamo: Replaced movie with a 12 frame improvement, and judging!
slamo: Good improvement! Accepting over the current publication.

despoa: Processing...

Last Edited by despoa 14 days ago
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