Kirby 64: The Crystal Shards/Pop Star 3

This castle belongs to King DeDeDe, with nine sections.

The first section is outside the castle, where you can simply advance until you reach the drawbridge. The second is a climb up the stairs. The third requires riding a platform, where you can inhale a few random flying enemies, and the fourth is a climb up onto an outer wall.

When you reach the outer wall, head left if you've taken any damage for a Maximum Tomato. On this wall, head to the right - in order to collect a shard, you will want to obtain a dual-cutter from some of the enemies in this area. Once you have dual-cutter, jump down the exit on the right. Only a simple sandwich is to the right of this drop.

After the drop, you can use the dual-cutter to reach the first shard. Adeleine will be in the next room, drawing a 1-up for Kirby.