Out of the Box writes: "Sharpen your skills with Rock! A fast and furious version of an old favorite. Using the traditional rules of Rock, Paper, Scissors, players flip over cards and race to name the winning card. Each card is different so it takes a sharp eye and quick wit."

Part of their Fun to Go series packaged in small tins, Rock! consists of a deck of 60 cards - 20 each of rock, paper, and scissors. Each player quickly turns over one of their 30 cards, and the first to call out the winner of the two cards wins both of them. If you call out a losing card (or one that's not there) then your opponent wins the two cards. When the deck is gone you count your cards and whoever has the most is the winner.

A twist is that recognizing the winning card is made more difficult by the fact that each card is different.
Cards come in five colors, each with four different depictions of rock, paper, and scissors:
Rocks - a stonehenge trilith, a boulder, an Easter Island moai, or a stone column.
Paper - a ream of paper, an origami swan, paperdolls, or a paper airplane.
Scissors - red shears, blue tailor scissors, green safety scissors, or a tiny pair of scissors on a swiss army knife.