In Main Phase 1, the Turn Player may:
- Normal Summon, Tribute Summon, or Set a monster.
- Special Summon a monster(s).
- Manually change the Battle Position or perform a Flip Summon on a Monster Card, provided it was not Set or Summoned this turn.
- Activate effects, such as those of "Barrel Dragon" or "Blowback Dragon".
- Activate or Set Spell and/or Trap Cards of any speed. Quick-Play Spell Cards and Trap Cards cannot be activated in the turn they are Set.
If a particular monster wasn't Summoned this turn, the Turn Player can flip it face-down using its effect (such as with "Guardian Sphinx" or "Swarm of Scarabs"), and then perform a manual Flip Summon on it, since the rules state that only one manual Battle Position change may be performed per turn; Battle Position changes by effects do not count towards this.
After Main Phase 1 has ended, the Turn Player may choose to enter the Battle Phase. If he/she chooses not to, play automatically proceeds to the End Phase (he/she may NOT enter Main Phase 2).
Monster Cards - Spell Cards - Trap Cards Types of Monster Cards Effect - Fusion - Normal - Ritual - Synchro - Dark Synchro Types of Spell Cards Continuous - Field - Equip Types of Trap Cards Continuous - Counter - Normal Other Types of Card Manga Cards Virus - Trap-Spell Equip Trap Cards - Field Trap Cards Turn Phases Draw Phase - Standby Phase - Main Phase 1 |
ATK - DEF - Level - Attribute - Type Playing Field Zones Monster Zones - Spell/Trap Zones Types of Summon Flip - Normal - Tribute | Activate - Chain - Costs - Counters - Destroy Types of Monster Effects Continuous - Flip - Ignition - Quick Compulsory - Optional - Lingering Types of Effect Monsters Flip - Gemini - Spirit - Toon - Tuner - Union - Dark Tuner Types of Spell Speed | Tournament Guidelines Duel - Infinite Loop - Maintenance Costs Double Tributer - Victory Conditions Attributes DARK - EARTH - FIRE - LIGHT - WATER - WIND Types Aqua - Beast - Beast-Warrior - Dinosaur |