Pick a tile. Round 1 shows a photo; name the device. Round 2 gives you the job; answer in the form of a question, "What is a switch?" Tap Show answer, then be honest: Got it adds the value, Missed subtracts it. Three tiles per round are Daily Doubles worth twice their value. Your board and score are saved in this browser until you reset.
Values run 100 (easy) to 1000 (hard). Top possible score across both rounds: 24,500.