The Mattel Uno No Mercy combo pack includes three classic card games: Uno, Uno Flip, and Phase 10, designed for 2 to 10 players. Players compete individually or in teams to be the first to discard all their cards. In Uno, the standard rules apply, with players using action cards like skips, reverses, and wild cards to hinder opponents. The "No Mercy" variant introduces a rule where players must call out "inch dosinch" when down to their last two cards. Uno Flip adds a double-sided deck and a flip card, introducing new mechanics like Draw Five and Skip Everyone cards for faster-paced gameplay. Phase 10 remains a separate game included in the set, offering a distinct rummy-style challenge. The pack is suitable for casual play, parties, or gifting.