Fun Monster Math: Primary Math is a free Android game developed by TnTGameWorks that makes learning addition and subtraction fun for all ages. The game features cute maths monsters that help you learn math in a fun and engaging way. The game has varying levels of difficulty for both addition and subtraction, and you can also practice both at the same time.

The game offers five different number groups for learning, ranging from 0 to 100. In addition, the latest release of the game has added several new features, including the ability to select the number of questions per round, earn stars as you answer questions, and use your stars to purchase stickers. The collector's book shows you how many of the 260 stickers you have already collected, and you can drag and move the stickers wherever you want them to be. Moreover, every day when you return, there are eight new stickers you can buy.

Overall, Fun Monster Math: Primary Math is an excellent way to learn math in a fun and engaging way. If you enjoy the game, please rate it and support the developer.