Seiji Kanai created the two-player abstract game RR – Regality and Religion – for a design competition with this restriction: "Create a game for 500 yen" (about $5). The game consists of 16 cards.
First released as R, later RR (in partnership with AEG), and finally as Brave Rats (with Blue Orange) is a simple and short simultaneous action selection game for two that's played with cards. Both players have a hand of eight cards, numbered 0 to 7, with each card having a special power. Both players choose a card, then reveal them simultaneously. The highest card wins the round, and players play until someone has won four rounds. The cards' special powers greatly influence the game.
This edition is the special English version of the original R game, with the original graphics from the Japanese Edition.