Dimension is a 1-4 player puzzle game that works on processing speed and hand-eye coordination. You have to follow many different rules at the same time to build your pyramid before the timer runs out. According to the rules, you reveal 6 rule cards per round that players will strive to follow. These rule cards are all discussed before starting the time to ensure everyone understands them. For younger players, or for your first game or two, I would suggest only setting out 3-4 rule cards per round.
After discussing the rule cards, the timer is started and everyone starts building their pyramids. Once the timer runs out, you must stop. Then everyone scores. If you finish before the timer, use the extra time to double check that you followed all the rules.
You gain one point per sphere in your pyramid. You lose two points per rule that you broke, if any. And if you followed all the rules and used at least one of every color of sphere, you get a special token. You want to collect as many of these as possible. They will score at the end of the 6 rounds. If you don't have enough of them, you will lose points. Everyone starts the game with 10 points.
I really like Dimension. It works your brain in a different way than a lot of games. The time limit can be frustrating and stressful, which is why I suggest starting with fewer rule cards than the rules stipulate. Work your way up, gaining understanding, confidence, and skills as you do. Think you'd like to give it a go? You can purchase Dimension on Amazon.