OCCAM

Some rows get in, some don't. Work out why. Tap any row to copy it, change one thing, ask again.

ACCEPTED

REJECTED

Your row
color
shape
size

New puzzle every day at midnight UTC.  

How to play

The box is hiding a rule. Might be something like "at least two red tiles". Might be meaner than that.

  1. Build a row and ask. The box answers yes or no, and nothing else.
  2. Your rows pile up in the two columns. Whatever separates them is the rule.
  3. When you think you see it, hit Prove it: eight rows you haven't seen, four in and four out, all eight right or nothing.

You never have to put the rule into words, only show that you know it. Fewer probes scores better. A hint costs 2, a failed proof costs 5.

Nothing here to paste into ChatGPT, by the way. The rule only exists on the server, and the one way at it is to run experiments.