RULES & HOW TO PLAY

• E = Easy / M = Medium / H = Hard.
• Highscore, Coins and Answer Sheet are saved in your browser (LocalStorage). Do not Clear History browser unless you intended to perform full reset.
• New Game while unfinished = current challenge is counted as Failed for this level.
• Rewards on completion: Easy +10 coins, Medium +15 coins, Hard +25 coins.
• Instant Solve reveals the whole solution and costs: Easy 50, Medium 75, Hard 125 coins. Using Solve forfeits the win reward. You also can use Hint repeatly to reveal all the number into a block (unlimited, free for Hint usage).
• Instant Solve shows full solution (costs: 50/75/125). No reward if used.
• Use the number bar 1–9 OR the eraser to input/clear block.

• Print PDF to play on paper (offline). The PDF shows the Challenge ID each challenge session.

• If you're stuck, simply enter the Challenge ID to access the answer sheet. Your session answers are stored using LocalStorage, so avoid clearing your browser history unless you intend to perform a full reset.
• The way you choose to solve it is entirely up to you. If you're looking for a real challenge, you can try to solve it without using any Hints or an Instant Solve