boardgame-core/src/samples/boop/rules.md

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Boop

Game Overview

"boop." is a deceptively cute, oh-so-snoozy strategy game. Players compete to place their cats on a quilted bed, pushing other pieces out of the way.

  • Players: 2
  • Ages: 10+
  • Play Time: 1520 minutes

Components

  • 1 Quilted Fabric Board (the "Bed") — 6×6 grid
  • 8 White Kittens and 8 White Cats
  • 8 Black Kittens and 8 Black Cats

Objective

Be the first player to line up three Cats in a row (horizontally, vertically, or diagonally) on the 6×6 grid.

Setup

  • Each player takes their 8 Kittens into their personal supply.
  • Cats are kept off to the side until a player "graduates" their Kittens.
  • The board starts empty.

How to Play

On your turn, perform the following steps:

1. Placing Pieces

Place one Kitten from your supply onto any empty space on the bed.

2. The "Boop" Mechanic

Placing a piece causes a "boop." Every piece (yours or your opponent's) in the 8 spaces immediately surrounding the piece you just played is pushed one space away from the placed piece.

  • Chain Reactions: A "booped" piece does not cause another boop. Only the piece being placed triggers boops.
  • Obstructions: If there is a piece behind the piece being booped (i.e., the space it would be pushed into is occupied), the boop does not happen — both pieces stay put.
  • Falling off the Bed: If a piece is booped off the edge of the 6×6 grid, it is returned to its owner's supply.

3. Kittens vs. Cats (The Hierarchy)

  • Kittens can boop other Kittens.
  • Kittens cannot boop Cats.
  • Cats can boop both Kittens and other Cats.

Graduation (Getting Cats)

To win, you need Cats. You obtain Cats by lining up Kittens:

  1. Three in a Row: If you line up three of your Kittens in a row (horizontally, vertically, or diagonally), they "graduate."
  2. The Process: Remove the three Kittens from the board and return them to the box. Replace them in your personal supply with three Cats.
  3. Multiple Rows: If placing a piece creates multiple rows of three, you graduate all pieces involved in those rows.
  4. The 8-Piece Rule: If a player has all 8 of their pieces on the board (a mix of Kittens and Cats) and no one has three-in-a-row, the player must graduate one of their Kittens on the board into a Cat to free up a piece.

How to Win

A player wins immediately when they get three Cats in a row on the bed (horizontally, vertically, or diagonally).

Note: If you line up three Cats during a Kitten graduation move (e.g., three Cats are moved into a row because of a Kitten being placed), you also win.

Strategy Tips

Because every move pushes other pieces away, players must think several steps ahead to "trap" their own pieces into a row while knocking their opponent's pieces off the board or out of alignment.