SumRace — maths & logic puzzles against the clock

Fifteen puzzle games, three difficulties, a seeded daily set that is the same for everyone, global leaderboards and live head-to-head races.

The puzzles

• 🔺 Number Pyramid — Fill the gaps in a pyramid where every block is the sum of the two below it.
• 🔢 Operator Gap — Pick the right + − × ÷ operators to make the equation true.
• 🎯 Target Number — Countdown-style: combine the dealt cards to hit the target number.
• 🟦 Magic Square — Complete the grid so every row, column and diagonal sums to the same number.
• ⊞ Futoshiki — A Latin-square puzzle where inequality signs between cells must be obeyed.
• ➗ Missing Digits — Restore the hidden digits so the equation balances.
• ✖️ Crossmath — A crossword where every across and down "word" is a true equation.
• 💡 Lights Out — Tap cells to toggle lights and clear the whole board.
• 🧮 Calcudoku — Fill the grid so each cage reaches its target with the given operation.
• 🏙️ Skyscraper — Place tower heights so the edge clues count exactly what is visible.
• ⚫ Binary — Fill 0s and 1s — equal counts per line and never three in a row.
• 🗼 Tower of Hanoi — Move the whole stack to the last peg in the fewest moves.
• 📐 Kakuro — A crossword of sums — every run of cells must add up to its clue.
• ⬛ Hitori — Shade cells so no number appears twice in any row or column.
• 🧩 15-Puzzle — Slide the numbered tiles back into order in the fewest moves.

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