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I can recommend some Building Block Kits that you can use to exercise your mind and creativity:

Using building block kits can help exercise your problem-solving and spatial reasoning skills, as well as your creativity and imagination. It can be a fun and engaging way to stimulate your mind and challenge yourself to build new and exciting structures.

LEGO Classic Creative Bricks Set: This set contains 221 pieces in a variety of colors and shapes, allowing you to build a wide range of models and structures.

K'NEX 70 Model Building Set: This set contains 705 pieces that can be used to build 70 different models, including vehicles, animals, and machines.

Magformers Basic Set: This set contains 30 magnetic building pieces that can be used to create 3D structures and designs.