A=B

In A=B, you solve programming puzzles by writing rules in a tiny language: each rule replaces one piece of text with another. You decide how to combine these simple substitutions to make inputs produce the required outputs.

Puzzles ask for a range of transformations, from changing letters to uppercase to multiplying binary numbers. As you progress, you tackle more involved problems using the same basic replacement mechanic.

After solving puzzles, you can take on line-count challenges to make your programs more concise. The game also includes a built-in minigame and interactive story elements.

Reviewers often praise the inventive use of a minimal text-replacement system, describing the puzzles as rewarding when a solution clicks. Some also enjoy the line-count challenges and the computer-science ideas behind the rules. Others find the later puzzles sharply difficult or the instructions ambiguous, and opinions on the included minigame differ.