Programming puzzles:
Test your programming skills by guiding this robot to find the blue boxes and light the bulb: https://lightbot.com/
Logic puzzles:
Do you enjoy figuring out mind bending logical puzzles? Check out if you can handle truth tellers and liars over here: https://brilliant.org/wiki/truth-tellers-and-liars/
Turing Tumble online:
Can you imagine a marble-powered computer? You can try it online here! https://tumble-together.herokuapp.com/