Course and exit checklist for Twin Bridges.
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Route
Courses in this region: 
Cheese Bridge Area, 
Soda Lake, 
Cookie Mountain, 
Butter Bridge 1, 
Butter Bridge 2, #
4 Ludwig's Castle. See the ordinary destination and alternate routes for how these connect.
Alternate routes
Cheese Bridge Area: Go below the first goal, then rise behind it to reach the second gate. Fly with a cape or jump off Yoshi after passing under the goal.
Course notes
Cheese Bridge Area: Ride the moving platforms and avoid the saws and Bullet Bills. The visible goal opens Cookie Mountain; the second gate is below and beyond it.
Soda Lake: Swim carefully past the torpedoes and fish; keep distance from launchers so their shots can be seen. The goal opens a Star Road route.
Cookie Mountain: Watch Sumo Bros' lightning and the enemies around the pipes. Take the midpoint before the final stretch to Ludwig's Castle.
Butter Bridge 1: Keep the piston lifts high by jumping; allow the lift to sink when you need to reach the lower platform chain. Avoid falling between moving platforms.
Butter Bridge 2: Use the ground and platforms to advance past Super Koopas. A cape and the midpoint make the long bridge more forgiving.
#4 Ludwig's Castle: Time the moving obstacles and use the ON/OFF switch as the route requires. Against Ludwig, avoid his fire and stomping attack, then jump on him when exposed.
Checklist
Cheese Bridge Area — normal and secret
Soda Lake — one exit
Cookie Mountain — one exit
Butter Bridge 1 — one exit
Butter Bridge 2 — one exit
#4 Ludwig's Castle — one exit