Chock A Block NF Font

No mystery here: this typeface derives its inspiration from children’s wooden blocks.

The uppercase letters are on a light ground, and the lowercase letters are reversed, so you can mix-and-match upper and lower to create the random nature of words or phrases constructed with real blocks.

The commercial font is "new and improved" over the freeware version, with expanded character set and improved kerning, so you get what you pay (or don't pay) for.