Number Cup Shuffle
Number of cups
Numbers
Pick 3, 5 or 7 cups, then use Quick Pick (1, 2, 3…) or type your own numbers. The numbers are hidden under the cups. Press Shuffle and the cups really swap places, each number moving with its cup. Then pick one cup to lift it and reveal your number. Swaps are chosen with your browser's cryptographic random source, and nothing is sent to a server.
FAQ
Are the numbers really shuffled?
Yes. Every shuffle is a series of real swaps chosen by your browser's cryptographic random source. Each number stays under its cup and moves with it, so what you see is what happened.
Can I use my own numbers?
Yes. Choose Custom Numbers and a box appears for each cup. Enter whole numbers of up to 6 digits (negatives are fine), then press Hide numbers under cups.