Intruder
A series of small numbers, easy to add up, and one big number that shows up in the middle, or at the very end. The trap: getting lulled by the small ones and missing the big one. A mode to stay alert until the last number.
How to play
Small numbers to add up, and a big one that pops up at any time. Don't let it slip by.
Example
2 − 1 + 37 − 3 = 35
Tips
- The big number can come last: stay alert until the end.
- When it comes, add the tens first, then the units: + 37 is + 30 then + 7.
- It can be negative: check its sign.
Solo or against someone
Solo, go as far as you can: the first mistake ends the game. Against someone, you play the same levels as your opponent: if you're the only one with the right answer, you win. All the rules