Heart Island is one of 11 accessible islands in the Great Sea in Paper Mario: The Origami King. It is found in the center of the sea, charted in territory D-4 on the Sea Chart with a heart icon. This is one of the four suit islands to be found, along with Club Island, Diamond Island, and Spade Island. While there are no Collectible Treasures to be found on the island, there are two Toads to be rescued, five Not-Bottomless Holes to repair, and only one ? Block to be struck. Additionally, a MAX UP Heart can be found here.
Upon arriving at the island, Captain T. Ode notes its shape and names it accordingly. Once Mario and Olivia get off the boat and onto the dock, many more shrubs are revealed than can be seen at first glance. In fact, there are shrubs all over the island, with almost no enemies. There is a stone Toad statue on top of the island. Mario can hammer a shrub to knock it over and reveal a button on the other side, which can then be hammered to trigger an event changing the layout of the island.
To solve this riddle and complete the island, Mario must change the shape of the statue, turn it to the left, bring up the missing piece of the island, and drop the stone ball. This causes it to roll onto the main layer of the island, allowing Mario to get onto the ramp and travel up to the top of the island. Here, Mario can examine the statue to see a diagram indicating that this island forms a baseball diamond layout with three other islands, Heart Island corresponding to the home base. On the ledge off to the right is a chest containing a Toad. Believing Mario may be disappointed he is not a real treasure, he marks a spot on the Sea Chart where a treasure is to be found to make up for it. Before leaving this island, Mario can activate the large neon heart on the pillar in the center of the island to reveal what appears to be a Heart. To the right of the statue is a bush with a button Mario must hit to create a bridge allowing him to reach the pillar. However, hammering the heart reveals it is actually a Toad. Believing Mario may be disappointed he is not a real heart, the Toad gives Mario a MAX UP Heart worth 20 extra HP. There are a few Not-Bottomless Holes on this island, around the pillar at the center of the island and close to the dock.
After they return to The Princess Peach, these Toads are seen sharing a table by themselves at the ship's bow.
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