Thirty €1 coins are arranged in a circle on a table. Ten of these coins are fake and a little lighter than the 20 real coins.

This puzzle originally appeared in Spektrum der Wissenschaft and was reproduced with permission. We’d love to hear from you!

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Call of Duty: Black Ops 6 offers a brand-new set of Multiplayer and Zombies Mastery Camos for players to unlock. Here's how to get them. To solve the Safehouse puzzles in Black Ops 6's Campaign ...

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Call of Duty: Black Ops 6 has a brand new campaign for players to enjoy from Treyarch and it includes quite a few puzzles for players to sift through and find the solution for. One of the earlier ...

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Call Of Duty: Black Ops 6 is finally here and the campaign is packed with stuff to do this year. There are open-ended missions to take on, buffs to earn and puzzles to solve, which should keep you ...

For the full solution you need to unlock the Safehouse safe in Call of Duty: Black Ops 6, just follow our guide below. The first puzzle kicks off in the basement, which case be accessed by the ...