How do you mentally stimulate a 2-year-old?

How do you mentally stimulate a 2-year-old?
Brain-building fun: 6 activities for toddlers and preschoolers

Blocks.
Sand and water.
Reverse follow-the-leader.
Dress-up.
Pretend cooking.
Hide-and-seek.

Brain-building fun: 6 activities for toddlers and preschoolers
  1. Blocks.
  2. Sand and water.
  3. Reverse follow-the-leader.
  4. Dress-up.
  5. Pretend cooking.
  6. Hide-and-seek.
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