Nim variants
Other ways to play Nim, each one ready to play here. Read how a variant changes the rules, then start a game with it chosen in the table setup.
Subtraction game
Nim with a cap on every move: you still take from one heap of your choice, but never more than k objects, with k from 2 to 5 chosen in the table setup.
Wythoff's game
Two heaps and a second kind of move: take any number from one heap, or the same number from both, in a game whose solution follows the golden ratio.
Fibonacci Nim
One heap, and each take is limited by the one before: the first move may not take everything, and every later move takes at most twice the previous one.
Kayles
A row of pins instead of heaps: knock down one pin or two pins standing side by side, and whoever knocks down the last pin wins.
Northcott's game
A board of rows, each with one counter per player: slide your own counter along its row either way without jumping, and whoever cannot move loses.