Arimaa is an abstract strategy game that looks deceptively simple but hides insane depth. You command an animal army (elephants, camels, horses, dogs, cats, and rabbits) on an 8x8 grid, aiming to sneak a rabbit to the opposite side. Sounds easy? Well, stronger animals can freeze, push, or pull weaker ones — plus there are traps that remove pieces. Each turn, you distribute 4 'steps' among your pieces, creating a strategic ballet of movements and blocks. Designed in 2002 by AI engineer Omar Syed to be harder for computers than chess (he succeeded: AIs only beat top humans in 2015!). The beauty lies in simple rules combined with endless possibilities — teachable in 5 minutes but taking years to master. Bonus: it uses standard chess pieces, so you can easily improvise a game.