Ciro Santilli @cirosantilli 37

Solution:

Solutions to the ProjectEuler+ version:

The original can be found with:

This was a registration CAPTCHA problem as of 2025:Python solution:At: euler/0.py

They are moving to 2d discrete AI games.

Although there is merit in that, it is a shame that it just similar to other pre-existing work such as gvgai and many others.

Solutions to these solutions require much more thought to formalize a solution.

Also the solutions are much less unique, finding the actual optimal solution being obviously NP-hard.

These aspects make those games much less elegant than the older ARC-AGI 1 and 2 counterparts.

The tagline smells like bullshit:

As mentioned at euler.stephan-brumme.com these tend to be harder, as they have their own judge system that actually runs programs, and therefore can test input multiple test cases against their reference implementation rather than just hard testing the result for a single input.

Goes only up to Project Euler problem 254 as of 2025, which had been published much much earlier, in 2009, so presumably they've stopped there.

Cool deeptech ones:

Evil finance ones:

Boring ones:

International ones with a British presence:

Bibliography:

www.kaggle.com/code/allegich/arc-agi-2025-visualization-all-1000-120-tasks contains plots of all questions and answers. It is truly very convenient.

Their description is a bit of localization randomness: