Beyond power-ups, several key items and special blocks play crucial roles in progression and secret discovery:
- P-Switch: A blue switch that, when hit, temporarily transforms all coins on screen into blocks and all blocks into coins. This is often used to create temporary platforms or access hidden areas. The effect is temporary, so act quickly!
- '!' Blocks (Yellow, Green, Red, Blue): These blocks are initially transparent and intangible. Once the corresponding Switch Palace is activated, they become solid, revealing coins or providing platforms.
- Key and Keyhole: Found in secret areas of certain levels. Collecting the key and bringing it to the keyhole will unlock a secret exit, often leading to a new path on the world map, a Switch Palace, or the Star Road.
- Message Blocks: These blocks provide helpful tips and hints about gameplay mechanics or level specifics. Always hit them when you see them.
- Coin Blocks: Standard blocks that release coins when hit. Some are multi-coin blocks that release several coins.
- Spin Blocks: Blocks that can only be broken by a Spin Jump. Often hide secrets or provide access to new areas.
Understanding the function of these items and blocks is essential for uncovering all of Super Mario World's secrets and navigating its more complex levels.