• Darkfire Dragon: Firegrass with a level 5 Petit Dragon
• Flame Swordsman: Flame Manipulator with level 4 Masaki the Legendary Swordsman
• Flying Penguin: Penguin Soldier with Level 2 Penguin Knight
• Gate Guardian: Sanga with Suijin and Level 3 Kazejin
• Harpie Lady Sisters: 3 Harpy Ladies at Level 3
• Blue Eyes Ultimate Dragon: Fuse 3 level 2 Blue Eyes White Dragons
• Cyber Saurus: level 5 Blast Juggler with a level 4 Two-Headed King Rex
• Kaminari Attack: Ocubeam with a level 5 Mega Thunderball
• Kwagar Hercules: Hercules Beetle with level three Kuwagata Alpha
• Metal Dragon: Level 3 Lesser Dragon with Level 3 Steel Ogre Grotto 1
• Metal Zoa: Level 2 Zoa with a level 3 steel scorpion
• Millennium Golem: Destroyer Golem with level 5 statue from Easter Island at
• Rabid Horseman: Battle Ox & Mystic Horseman at level 3
• Summoned Lord Exodia: Level 2 right and left arms and legs and Exodia the Forbidden one
• Thousand Dragon: Time Wizard level 3 with Baby Dragon level 5
• Twin-Headed Thunder Dragon: Thunder dragon at level 4 with a Thunder dragon at level 4.

• Celtic Guardian:You must surrender 20+ times in Area 3 and 4
• Crow Goblin: You must have less than 10 wind monsters after Area 1
• Firewing Pegasus: After 10+ hours of play and in Area 2
• Sinister Serpent: Have 50+ water monsters

Usually when a monster or capsule is destroyed, you cannot use it during the next round. However, if you start the next round and bring up the menu with "End Turn", "Unit List", etc. and go to "Surrender" and select "Try Again", you will restart the level with all your monsters available for use.