Underc0de Day 2026 · October 12
Capacity Rushchallenge
Choose a task, then assign a plan with enough capacity. You have 60 seconds.
I just want to join
Underc0de Day: signing up enters you in the draw for 3 months of Pro. Terms
Capacity Rush challenge: the best score at 19:30 wins 1 year of Pro. Play →You’re on the list.
You’re already on the list.
That’s a complete signup.
We’ll email you when early access opens.
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We’ll email you when early access opens.
You’re also entered in the Underc0de Day draw.
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How to play
Choose a task
Each task has a cost and expires in 6 seconds.
Assign a plan
Use a plan with enough capacity. Each success earns points and a combo bonus.
Watch the resets
Each plan regains capacity when it resets. You have 60 seconds.
Your details to play
Choose a task, then assign a plan with enough capacity. You have 60 seconds.
One sign-up: playing puts you on the waitlist and also enters you in the 3-month Pro draw. View terms
Tasks
Choose a taskThe next task will arrive in a moment
Plans
CapacityGet ready
3Capacity Rush · 60 s
Run complete
0
Score
0 completed0 lost
- Rank
- —
- Best score
- —
You’re on the waitlist and in the 3-month Pro draw.