I had seen one of them, AntiVirus (also free) by Kevlanche, among the new releases, but I had skipped it because from the screenshots it looked like a quick two days work.
#47 out of 2213, so pretty good!). Ludum Dare is a competition where contestants are required to write a game from scratch in 48 hours.
If you are curious how a game can be written in 48 hours, there's an interesting timelapse video of how it was done.
AntiVirus is a clever twist on Sokoban. Your objective is to push all boxes onto the goal positions, but you don't control actions directly: instead, you have to create a script of no more than 10 moves.
Additionally to the balls you control, there are also orange balls. They execute predetermined programs which cannot be changed.
I think that the game that took part in the Ludum Dare competition consisted of just the first chapter. The two additional chapters add several new mechanics which make the puzzles a lot more interesting.
HyperThreading cells give you more power so you move by two steps at once (and can jump over walls, for example):
Difficulty grows significantly throughout the game and the last puzzles of chapter 3 are pretty hard.
There are several delightful subtleties, for example normally if you hit another ball you would crash, but if two balls go towards each other at exactly the same time, instead of crashing they simply swap places.
The user interface works ok, but I didn't find it particuarly intuitive, and often entered incorrect commands by mistake. That might just be me.
The free version contains the full first chapter, but you want to try it first be warned that when you buy the full version you will have to start again from the beginning. I would go for the paid version right away, it's well worth the price.
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