To find all the puzzle pieces in the 6-5 Precarious Plateau level of Donkey Kong Country Returns, follow these detailed steps:

### Puzzle Piece 1: K

1. **Start of the Level**:
– Begin by blowing on the pinwheel near the start of the level to reveal a hidden area.
– Bounce off the Tiki into the covered structure to get Rambi. Rambi can plow through the big spiked boulders.

2. **Platform Jump**:
– Jump from the platform on the right to reach the K letter.

### Puzzle Piece 2: Break Apart Rambi Block

1. **Access Bonus Area**:
– Break apart the Rambi block to access a bonus area. This will reveal new platforms and paths.

2. **Moving Platforms**:
– Use the moving platforms to hop back and forth. Land either in the center or on the lower moving platforms. Starting at the top and dropping down while hovering across works best. You can also do roll-jumps from one moving side to the other to clear things out horizontally.

### Puzzle Piece 3: Blow on Pinwheel

1. **Pinwheel Location**:
– Blow on the pinwheel just past the DK Plate to reveal another Puzzle Piece.

### Puzzle Piece 4: Plow Through Rambi Blocks

1. **Rambi Blocks**:
– Plow through the Rambi blocks by the DK Plate. The Puzzle Piece and a bunch of bananas are on the other side.

### Puzzle Piece 5: Grab Bananas Around Flaming Spike Wheel

1. **Flaming Spike Wheel**:
– Grab all the bananas around the last circling flaming spike wheel. The Puzzle Piece will appear once all bananas are collected.

### Additional Tips for Time Trial:

– **Speed Run**: Instead of taking the time to get Rambi, speed through the level using the roll jump and hover technique.

By following these steps, you should be able to find and collect all the puzzle pieces in the 6-5 Precarious Plateau level of Donkey Kong Country Returns.