Yu-Gi-Oh! GX Duel Academy Puzzle: 070


 * Activate Cathedral of Nobles.
 * Set Red Gadget - Stronghold and activate it immediately (which you can due to the Cathedrals effect).
 * Now tribute the Trap Monster to summon Catapult Turtle.
 * First catapult all the gadgets into your opponents LP, then finish him with turtles self-sacrifice.