There's an official port of this game on the DS. I saw a run that was 4 hours and 30 mins long, but it was done in other version of the game.
Maybe sub 4 is possible here?
Joined: 12/28/2012
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Location: United States
It's a fun game, but I think it'd make for a horribly dull TAS. The only places where time can be saved are by clearing the screen of all zombies right before boss waves or right at the end of levels. The rest of the time it'd just look like a normal player was playing it, only with superhuman plant-placing speeds and optimum strategies.
I'm not sure whether a TAS would be impressive or not, but your bolded statement is not true (at least in the PC version). The game uses adaptive difficulty. Just a little bit of testing shows that when you kill zombies faster, they come out faster and the level ends sooner. To test this, start a new game+ and buy plants like (off the top of my head) sunflowers, garlic, wall nuts, and cherry bombs. Plant four long rows of garlic, leaving the center lane open but with a wall nut or two at the end. The zombies will stagger back and forth until they find the center lane. You'll find that the zombies enter much more slowly and the level lasts much longer when played this way.
I'd be surprised if the DS version is different in that regard.
It makes sense that if you manage to kill things quickly, the game would automatically speed up. Who wants to play a game where the better you are, the more time you spend doing nothing?
Pyrel - an open-source rewrite of the Angband roguelike game in Python.