Gandalf encounters the Balrog in the under-mountain Caves of Moria. The result is a fantastic duel of their magical powers on a small bridge over a deep chasm. Here, players replay that duel with the help of cards, which have magical symbols on the left & right, representing the strength of the adversaries. The symbols on the cards represent the offensive (right) & defensive (left) strengths of the adversaries: each unblocked symbol is lost energy for that player. This strategy card game is for 2 players & takes about a half hour to play.