Kalkulko

Kalkulko is a playful math practice app for addition, subtraction, multiplication, and division.

Choose the number of problems, number range, and operation type. When the game starts, the timer runs, progress is counted, and every answer gets immediate feedback. Results can be saved to the leaderboard or compared with a friend in a live room-code duel.

Features:
- addition, subtraction, multiplication, and division
- 10, 20, 50, or 100 problems
- number range 10, 20, 50, or 100
- result history and online leaderboard
- two-player live room-code duel
- Czech and English

No ads and no in-app purchases.