If the part you enjoy most is combining arithmetic cages with row and column elimination, PUZRU offers a related style of reasoning in a deliberately compact format. Every live board is 6×6, uses 1–6 once per row and column, and gives every connected cage an addition target.
A lower rule burden, not a simpler race
Addition-only cages keep the interface readable, while the generated boards still have to pass an exact uniqueness check and a logical no-guess quality gate. That keeps the challenge focused on deduction instead of interpreting multiple operators.
Why the live layer changes replay value
PUZRU is not a catalogue of isolated levels. Everyone is solving the same current world puzzle; completed rounds become permanent archive pages; and six solved positions connect each puzzle to the next one.
Start in the 200-puzzle progressive Training Room to learn the rules without affecting the live leaderboard.
What changes in practice?
Put the idea into practice
The fastest way to understand the interaction between row, column and cage constraints is to solve a board. Start in the 200-puzzle progressive Training Room, then enter the live world whenever you are ready to race for Discoverer.