Spectre Mind: Simple Math is a fun free-to-play game for improving your memory. You're given two cards with numbers and math signs (addition, subtraction, division or multiplication) that you have to successively apply to these numbers. These are math equation. Memorize them and calculate the solution. Then choose the right answer. You have limited time to make a decision. Answering correctly gives you more time. Making a mistake reduces you time. The proposed exercise allows you not only to train your visual memory, but also to monitor your progress achieved as a result of this training, while the gamified format adds excitement to the process. As you progress through the puzzle, your memory will improve and the game will become increasingly easier for you to play. If you feel that the game has become too easy for you and you can honestly play it all the way to the end, then accept our sincere congratulations because it means that you have achieved incredible results in your visual memory training and can move on to more challenging puzzles. Spectre Mind is a series of free-to-play puzzle games aimed at brain training. Develop your logical skills, memory, and attention. By playing our brain teaser games, you train your brain and increase its power!