"3000 vs 3000" is a Duel Puzzle in Yu-Gi-Oh! Duel Monsters 5 Expert 1.
Setup
The player has 500 Life Points. Their hand contains "Cannon Soldier", "Catapult Turtle", "Dark Hole", "Key Mace", "Skull Servant" and "Shadow Specter" and their field contains three "Blue-Eyes White Dragon" cards in Attack Position".
The opponent has 3500 Life Points and three "Labyrinth Wall" cards in Defense Position.
The player is given the hint: You have a 3000 attack point "Blue-Eyes White Dragon" out, but it cannot defeat the 3000 defense point of a "Labyrinth Wall". This calls for direct damage. Use your cards wisely!
Solution
The puzzle is solved by Tributing a "Blue-Eyes White Dragon" to Summon "Catapult Turtle", then using the effect of "Catapult Turtle" to Tribute the remaining "Blue-Eyes White Dragon" cards, followed by itself to inflict 3500 damage.