Psychomaths

Make every line add up

Each row and column is a sum. Its target is at the end of the line, with what it comes to right now underneath.

Work each line out left to right, or top to bottom, like a calculator:

4 + 7 − 2 → 11 − 2 = 9
12 − 5 + 3 → 7 + 3 = 10

Numbers with a double border are given: they're already in the right square and stay put. Tap two of the others to swap them. Every swap is a move. A target turns gold when its line is right, and you're done when they all are. Any arrangement that makes every line right counts.

Three grids a day

Grids use the numbers 1 to 9 with + and − between them. You play them in order: Level 1 (Easy) is a 3×3 using each number once, with 3 squares given. Level 2 (Medium) and Level 3 (Hard) are 4×4, where some numbers appear more than once, with 6 and 4 squares given. Your score for the day is the three grids added together. New grids arrive at midnight Sydney time, which is midnight where you are.

Scoring

Each grid has a par: the fewest swaps it can be done in, plus 2 on Easy, 3 on Medium and 4 on Hard. Finish on par for 200 points. Every move under par doubles it (400, 800, 1,600 and so on). One over par scores 100, two over scores 50, and after that the par points are gone.

Hints

A hint flashes two numbers worth swapping. Use as many as you like: each costs 50 points and counts as a move, and you still make the swap yourself.