0Day streak
—Best time
0.0sThis solve
Everyone gets the same puzzle today. It's a Caesar shift — every letter is rotated by a fixed amount. Decode the message.
…
Your streak & best time are saved in this browser. Solving earns +40 XP once per day, which counts toward the all-time leaderboard.
0Score
60Seconds
0Best
How many you can nail in 60 seconds. Modular exponentiation and prime checks, back to back. Chain correct answers to build a combo.
0Streak
1Level
♥♥♥Lives
0Best
Three lives. The numbers grow with every correct answer. One wrong answer costs a life — how far can you climb?