Brainy puzzle game KaruQ is haunted by ghosts. And the only way to get rid of them? Getting creative with the numbers you’re given and hitting that spooky spirit with digits that match theirs!

What we love: Flexing our maths and ghost-busting skills at the same time. Pluck the number you’re given from the candle, then put two or more of them on the wand to multiply them. Tapping a number divides it into two smaller natural numbers. And using a match lets you add to your current number by one. If your number goes over 100, the hundreds digit is dropped, leaving only the last two digits. Keep repeating this process until you reach the target, or if you get stuck, check out Hints or Answers for clues.

Quick tip: Create your own problem cards and challenge yourself to find a solution. Once you’ve solved it, generate a QR code for the problem and share it with other players on social media.

Meet the creator: This game is developed by Ryuji Kuwaki, an indie game developer also known for titles including SubaraCity and The King of Discovery.