Yu-Gi-Oh! GX Duel Academy Puzzle: 015

1. Summon Gearfried the Iron Knight.

2. Activate Release Restraint, sacrifce Iron Knight and summon Gearfried the Swordmaster.

3. Equip Swordmaster with Lightning Blade and destroy Maiden of the Aqua with his effect.

4. Enter Battle Phase and attack Crab Turtle.