Today's problem

Sunday 6 September

One problem. Everybody gets the same one. No timer, no strikes, no mercy. The XP drops with every wrong answer though, so first try is the only try that really counts.

2× XP weekend. Today's problem pays double. Go on.

Everyone gets the same one. Grab an account and have a go.

The daily pays real XP into a real account, so it needs one. Ten seconds, no password, no card. Then come back and ruin somebody's streak.

Sign in and solve itor play a Sprint with no account at all

Next problem in soon. Or go play a full Sprint