A number game in Crux # Chain Sum > Chain Sum is a number game in Crux, free on iPhone and iPad with no ads. Chain touching tiles of the same number and they add up on the last one you tap. Reach the target tile before you run out of moves. Chain the numbers and watch them add up. Get Crux Free on iPhone and iPad. No ads. ## How to play Chain Sum Chain touching tiles of the same number and they add up on the last one you tap. Reach the target tile before you run out of moves. ## How it fits your day Chain Sum is one of a ton of games in Crux, with a new set of daily puzzles every day, no ads and nothing you have to buy to play. Your streak grows each day you play, and you can compare results with friends (friends are off under 13). Crux has a No Wifi section with practice rounds you can play offline; the daily games download each day's puzzle when you are online. ## Who it suits It suits people who like numbers and quick mental arithmetic. ## About Crux Crux is a free iPhone and iPad app from Pizzart Pte. Ltd. with a ton of daily word, logic, number, geography, trivia, colour and arcade games, and no ads. Every game is free to play and none needs a purchase: some open after a few days of play, or sooner with coins you earn by playing. Optional Crux Plus costs $4.99 a month or $39.99 a year in the US. [The facts](https://crux.quest/ai) · [Questions](https://crux.quest/faq) · [What no ads means](https://crux.quest/no-ads) ## More games like Chain Sum - [Equation](https://crux.quest/games/equation/) - [Number Match](https://crux.quest/games/number-match/) - [Reckoner](https://crux.quest/games/reckoner/) - [Number Merge](https://crux.quest/games/number-merge/) - [Line Sums](https://crux.quest/games/line-sums/) - [Drop Merge](https://crux.quest/games/drop-merge/) [See all games](https://crux.quest/games/)