Course and exit checklist for Yoshi's Island.
On this page
Route
Courses in this region: 
Yoshi's Island 1, 
Yellow Switch Palace, 
Yoshi's Island 2, 
Yoshi's Island 3, 
Yoshi's Island 4, #
1 Iggy's Castle. See the ordinary destination and alternate routes for how these connect.
Course notes
Yoshi's Island 1: Slide down the opening slopes through the Rexes, then watch for Banzai Bills. The pipe through turn blocks offers an underground detour and rejoins at the midpoint. Jump past the Chuck at the goal.
Yellow Switch Palace: Press the P-switch in the first room to collect coins, then enter the pipe and press the large yellow switch. Yellow dotted outlines become solid blocks throughout the world.
Yoshi's Island 2: Use shells against Koopas, find Yoshi in a question block, and ride through the mole hills. Keep Yoshi clear of the 
Chargin' Chuck near the end.
Yoshi's Island 3: Wait for the swinging lifts to carry you across the gaps. Use the midpoint before continuing over the moving platforms and Paratroopas.
Yoshi's Island 4: Cross the water and avoid the floating mines. Stay on safe ground around Pokeys and use the midpoint before the last stretch.
#1 Iggy's Castle: Climb the fence, switch sides at revolving doors and avoid the climbing Koopas. In Iggy's room, stomp or fire at him to push him off the tilted platform.
Checklist
Yoshi's Island 1 — one exit
Yellow Switch Palace — one exit
Yoshi's Island 2 — one exit
Yoshi's Island 3 — one exit
Yoshi's Island 4 — one exit
#1 Iggy's Castle — one exit