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I try to use them but nothing happens. Only some ring sounds. Plus, there is like a few on them in 1st level. I saw the achievement but don't know how to get the job done.
This question / problem has been solved by KiNgBrAdLeY7image
The roulette? Take care not to have them hit by enemy fire or your own weapons, then keep using them until a strange sound plays and an item is dropped. This is a game of patience and luck... You can get a wide variety of items out of them.