Description from extension meta
Tendo는 수학 능력과 두뇌를 테스트하는 디지털 퍼즐 게임입니다.
Image from store
Description from store
In the Tendo game, put the numbers in the grid, if the name of a line is 10, you can eliminate a range. It looks like a math game. The goal is to add 10 in a row or column. Have fun.