punkx.org's rivals
Provides educational games and puzzles designed to teach programming, algorithms, computer memory, machine code, and UNIX commands to children.
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selfuniversity.sitenobody's claimed it
Interactive puzzles covering computer science and engineering topics.
How rivals are picked
Every square's description is compared with every other square's, and the closest thirty are read by an AI that keeps only real alternatives: products a customer would weigh against punkx.org. Add-ons, companion apps and neighbouring niches are left out. It reads what each site says about itself, so it can be wrong; tell us when it is.
Bulldozing costs what evicting costs: double what the owner paid, $1 minimum. It's anonymous, nobody moves in, and the lot reopens at $1, so they can come back. The longer version is evict your competitor.