, in which players

Boggle is a word game invented by Allan Turoff and originally distributed by Parker Brothers. The game is played using a plastic grid of lettered dice, in which players look for words in sequences of adjacent letters.

BoggleはAllan Turoff さんが発明し、元々はParker Brothersが広めた言葉のゲームです。このゲームはプラスチックの文字が書かれた基盤を使い～

, in which players のwhich は関係形容詞ですか？先行詞は何なのでしょうか？