Rubik Cubes. Rubik’s Cubes are a fun puzzle the increase cognitive endurance,spatial reasoning,and is overall fun. Firstly, it increases cognitive endurance.A 2025 study found that 33% of older adults showed improved cognition, while 78% showed improved dexterity after training. Secondly, it increases spatial reasoning with 46 quintillion possibilities or 46 with 18 zeros it makes you think outside of the box. Thirdly, it is fun it is a good way to fill up your weekend and get together with friends or potentially make new friends with common interests.