T-3 Sums Up
Also written T3 Sums Up · a T-3 game on zen2play
Build every number. Make every sum.
T-3 Sums Up is a cross-sum arithmetic puzzle played worldwide, built from our T3rminator™ pieces. Fill each white square with a number from 1 to 9 so that every run adds up to its sum — and no number appears twice in a run.
- 6×8 and 8×10
- Easy, Medium and Complex
- Exactly one answer, no guessing
- Three stars for a clean solve
A solved 6×8 from the game.
Three pieces, nine numbers
Every number on the board is built from T-3 pieces — one, two or three of them in a square.
Remember the traffic lights: Red is 1, Yellow is 2, Green is 3.
Every run adds up
A run is a line of white squares, across or down. Its sum sits on the raised face just before it — the down sum on the top face, the across sum on the left face.
No number twice
The numbers in one run are all different. 6 in two squares can be 1 + 5 or 2 + 4, never 3 + 3.
One to three pieces
Each square holds a number from 1 to 9, made of one to three pieces. Any mix that makes the right number is right: 6 is Green + Green, Green + Yellow + Red or three Yellows.
Playing
The Entry card decides what a tap does. With Piece menu, a small menu opens beside the square: tick the pieces you want and the square fills at once, with each run's sum, what the other squares already add up to and what is left. With Key in number, type 1 to 9 in the square and its usual pieces appear.
Every puzzle can be solved by thinking
Each puzzle has exactly one answer, and every step to it can be reasoned out — you never have to guess. The examples below show the ideas, one at a time.
Thinking it through, with pictures
Each example is a real puzzle from the game, before and after one idea. Every example was checked by the T-3 Sums Up engine.
Step by step, to the last square
A 6×8 from the game, solved one idea at a time — a picture each time a number is found.
Two sizes, three levels
6×8 · Easy, Medium
2,000 puzzles — quick to start, with Medium ones that ask for a forced number, a pair or a sum bound.
8×10 · Easy, Medium, Complex
2,000 puzzles with long runs, where Complex ones ask you to look ahead.
Your time and your stars
Pick 15, 30 or 45 minutes. A solve earns a star for no hints, one for no mistakes shown and one for finishing in time — and a Piece builder bonus when every square was built in the piece menu.
Show solution
Stuck? The answer is there — but a shown puzzle does not count as solved.