From the Manufacturer

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 and right, representing the strength of the adversaries. The symbols on the cards represent the offensive (right) and defensive (left) strengths of the adversaries: each unblocked symbol is lost energy for that player. This strategy card game is for 2 players and takes about a half hour to play.