The Wii Balance Board (WBB) works with 22 licensed retail games + Wii Fit Channel. Most are fitness/party titles.
Balance Board Homebrew Channel apps (e.g., WiiBalanceBoard tester, WiiFit save editors) work via Homebrew Channel.
Note: WBB pairs via Bluetooth (red sync button on board + console sync). One board per console. Calibrate in each game.