The term PENTA refers to a group of Pentaminos which completely covers the space defined by the slider on the game board. Katamino includes 500 PENTAS to challenge you. To play with two players, use the grid on the back cover of the rulebook. Place the 12 Pentaminos next to the grid. The first player selects one pentamino and places it anywhere on the grid. The piece must lay flat and completely inside the grid area. The second player then selects a pentamino and does the same. The winner is the last player to place a Pentamino completely on the grid. - OVER 500 CHALLENGES: Play it again and again, increasing the difficulty and changing the shapes used in each puzzle! - SOLO OR COMPETITIVE: Tweak the rules to play with another player, trying to be the first to completely fill your side of the board. - BEAUTIFUL WOODEN PIECES: Leave the game setup on your coffee table between challenges, since the attractive and colorful pieces make a nice accent to your decor. - CLASSIC PUZZLE: The game has had success for decades on end since its original release in the '90s, making it a true classic in the puzzle genre. - UNIVERSAL GAMEPLAY: This brain teaser is enjoyed by kids and adults alike, since the rules are easy to understand and the puzzle is satisfying.