Free projector game · 31 questions · no sign-up

Brain Teaser Showdown: logic puzzles for the classroom or office

31 classic brain teasers with a 60-second clock and a scoreboard. Most of them have a trap; the fun is spotting it.

Set up (30 seconds)

Teams Team names (optional, comma-separated) Questions

Open this page on the computer connected to the projector or TV, or AirPlay it from an iPhone or iPad.
Press Start. It goes full screen.
Show the puzzle, give teams 60 seconds to agree on one answer, then reveal. Talk through the trap before moving on.
Keys: T timer · Space reveal · → next · Esc exit. The + and − buttons keep score.
At the end, the winners' screen shows a QR code to the app and lets you download a winners' certificate to print or post.

Classroom warm-ups, staff meetings, team building and family game night.

A bat and a ball cost $1.10 together. The bat costs $1.00 more than the ball. How much is the ball? (5 cents. (Bat $1.05 + ball $0.05 = $1.10.))
What comes next: 2, 6, 12, 20, 30, ? (42. The gaps go 4, 6, 8, 10, 12.)
If 5 machines make 5 widgets in 5 minutes, how long do 100 machines take to make 100 widgets? (5 minutes. Each machine makes one widget in 5 minutes.)
I'm an odd number. Take away one letter and I become even. What number am I? (Seven. Remove the S and you get 'even'.)
A lily patch doubles every day and covers the lake on day 48. When did it cover half? (Day 47.)
Which is heavier: a kilogram of feathers or a kilogram of steel? (Neither. Both weigh one kilogram.)

Free for classrooms, churches, clubs and families. Please don't resell it.

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