Lava And Water Swap! -

: Use a resource pack to swap only the visuals. Players might jump into what looks like a refreshing pool of water only to realize it's actually lava—or tentatively touch a "lava fall" to find it's safe water. Puzzle & Interaction Mechanics

: In a puzzle-platformer context, players could use a "Phase Switch" button to instantly turn all lava into water and vice-versa, allowing them to cross previously impassable fire-pits or swim through former lava-falls. Lava/Water Switch Lava and water swap!

: Build a redstone-based Lava/Water Switcher . By using dispensers and pistons, you can create a single "tap" that toggles between pouring water and lava. This is often used in automated farms to either "wash" items or "cook" meat. : Use a resource pack to swap only the visuals

: Reverse the physical behavior of the fluids: : Reverse the physical behavior of the fluids:

: Normally, water cools lava into obsidian. In a swapped world, you could make lava "evaporate" water or turn it into a new hazardous block like Pumice or Superheated Glass .

could flow quickly like water (8 blocks), allow for swimming without damage, and even create "infinite lava" sources.