Pentago - Rules, History & Strategy Guide

Pentago was designed by Tomas Flodén and published by the Swedish board game company Mindtwister in 2005. It won the Mensa Select award in 2006 and has since become a fixture of the modern abstract strategy genre, sitting alongside Hive, Quoridor, and GIPF as games that take a single elegant mechanic and build a deep tactical space around it.

The Pentago innovation is the forced quadrant rotation — every turn ends with a 90° spin of one 3×3 region of the board. Even your opponent's placements can be scrambled by your rotation, which means the board state never settles. The game was solved (it's a first-player win with perfect play) by Erik van Bekkum in 2014, but at human skill levels Pentago remains genuinely tactical.

Pentago is played on a 6×6 board divided into four 3×3 quadrants, each of which can rotate independently. Players alternate placing marbles of their colour and rotating quadrants. First to get five marbles in a row wins.

1. On your turn, place one marble of your colour on any empty square.
2. Then rotate any one of the four quadrants 90° — clockwise or counterclockwise. You must rotate (no passes), even if it hurts you.
3. After the rotation, check for five-in-a-row. If you have five of your colour in any horizontal, vertical, or diagonal line, you win.
4. If both players make five-in-a-row from the same rotation, it is a draw.
5. If the board fills (36 marbles) with no five-in-a-row, the game is a draw.

• The centre of each quadrant doesn't move when you rotate that quadrant — it's the only stable square. Centre squares are gold for permanent threats.
• Plan two moves ahead: every placement is followed by a rotation, so think about what the board looks like AFTER your rotation, not just after your placement.
• Forced double threats win the game. If you can set up two open four-in-a-row lines that no single rotation can block, the win is yours.
• Watch out for "rotation traps" — your opponent might place a marble in a location that becomes a five-in-a-row after the rotation you're about to make.
• The first player has a small inherent advantage. The opening 4-5-6 moves are critical; mistakes there are very hard to recover from.

Standard Pentago is 6×6 with four 3×3 quadrants. There are 8×8 "Pentago XL" variants with larger quadrants for longer games, and a 4-player team version where two pairs alternate on shared colours. Arcadia's implementation uses the standard 6×6 ruleset.