The Angular Isles are a pair of small, blocky islands in close proximity. You can climb onto the larger of the two from the water. It features several movable blocks. Position these blocks so that you can reach the top of the isle, where something of value awaits you.
Piece of Heart #8
To get this Piece of Heart, climb onto the larger of the two Angular Isles and manipulate the movable blocks to reach the top of the isle. A chest at the top contains Piece of Heart #8.
Start by pulling out halfway the only movable block you can reach on this level. Use it to climb onto the second level of blocks.
Walk along the second level to another movable block. Push this one off the edge and down to the first level, then hop down onto it.
Position yourself behind the block you just moved, and pull it a short distance so that it lines up with a slight recess. Climb onto the block.
You now face a stack of two movable blocks. Pull the bottom one out halfway. Now climb to the top of the isle to find the chest containing Piece of Heart #8.
Piece of Heart #9 (via Treasure Chart #15)
Find and open Treasure Chart #15 (found inside the Forbidden Woods dungeon [F6]) to pull a chest from the Great Sea near the Angular Isles. The chest contains Piece of Heart #9.
Silver Rupee (via Secret Cave)
You must have the Mirror Shield to collect this Silver Rupee. From the top of the larger of the two Angular Isles, use the Deku Leaf to reach the smaller isle. Alternatively, use the Hookshot from the lowest level of the larger isle to pull yourself over to the palm tree on top of the smaller isle. Once you reach the top of the smaller isle, drop into the hole found there to enter a Secret Cave.
Inside this Secret Cave lies a tricky block puzzle. A tall stack of movable blocks is in the center of the cavern. Horizontal beams of light intersect at the top of the stack. A translucent treasure chest sits atop the north ledge. You must manipulate the stack of blocks to get at the chest.
Start by moving the lone bottom block on the left side of the stack. Push it to the other side of the stack and position it next to the rest of the blocks on the right-hand side.
Climb onto the block you’ve just moved and pull the next one out halfway. Drop back down and then pull the bottom block out halfway, creating a set of steps.
Climb onto the first block and again pull the second block out halfway. All the blocks that were stacked above the second block drop down one level.
Climb onto the block you’ve just moved and then pull the next one out halfway. Climb onto that one, and then climb onto the next block ahead.
Pull the next block out halfway and then climb onto the top of the stack of blocks. Several beams of light intersect at your location.
Use the Mirror Shield to reflect the light, aiming a beam to strike the translucent chest on the north ledge. Once the chest has materialized, use the Deku Leaf or Hookshot to reach the chest and open it for a Silver Rupee.