Survival
You start with thirty seconds. Every right answer buys you more, every wrong one costs you, and the problems get harder the longer you last. It ends when the time runs out — how long that takes is the score.
Operation
Start at
All four, shuffled
- You start with 30 seconds on the bank.
- Every correct answer adds 3 seconds.
- A wrong answer or a pass costs 5 seconds.
- Every 25 problems the difficulty climbs a level, and it never comes back down.