Calculate Drill is an Android game developed by BlueSky_JP that is perfect for anyone who loves math and wants to improve their calculation skills. The game has been downloaded over 1,000 times and offers four different modes of play.

In each mode, one character of a formula is replaced with a blank and the player must solve the equation by selecting the correct number or inputting it directly. The game offers both 1 digit and 2 digit calculations, with the latter being more difficult. The position of the blank is never the same, adding an extra level of challenge to the game.

Overall, Calculate Drill is a great way to improve your math skills while having fun at the same time. The game is free to download and play, making it accessible to everyone.