IQ Test Labs

Discover your intellectual strengths

practice questions

Puzzle games > logic puzzles

math puzzles
  • Sudoku: Solve the grid!
  • PIN cracker: Game similar to mastermind

More mind games, and brain teasers!


  • Each number can appear only once in each nine-square row, column or box.
  • Hints, notes, and puzzle solve.
  • Six levels of difficulty.

PIN cracker

  • Decode the PIN before time is up.
  • Correct digits and digit position reported after every move.
  • Game similar to Mastermind.®

widgets Latest post

Verbal > Analogies

new_releases Newsletter

Get new questions to hone your IQ!

whatshot In the news

Keeping the beat

drums beat

pie_chart Polls