Step 1: 💧 Water and 🌍 Earth

Combine 💧 Water and 🌍 Earth to create 🌱 Plant

Step 2: 💧 Water and 🔥 Fire

Next, combine 💧 Water and 🔥 Fire to create 💨 Steam

Step 3: 💧 Water and 🌬️ Wind

Then, combine 💧 Water and 🌬️ Wind to create 🌊 Wave

Step 4: 💧 Water and 💧 Water

Now, combine 💧 Water and 💧 Water to create 🌊 Lake

Step 5: 🌱 Plant and 💧 Water

And then, combine 🌱 Plant and 💧 Water to create 🐊 Swamp

Step 6: 🌱 Plant and 🌬️ Wind

As next step, combine 🌱 Plant and 🌬️ Wind to create 🌼 Dandelion

Step 7: 💨 Steam and 🔥 Fire

Combine 💨 Steam and 🔥 Fire to create 🚗 Engine

Step 8: 🌬️ Wind and 🔥 Fire

Combine 🌬️ Wind and 🔥 Fire to create 💨 Smoke

Step 9: 💨 Smoke and 🌊 Wave

Combine 💨 Smoke and 🌊 Wave to create 🏄 Surf

Step 10: 🌊 Lake and 🌊 Lake

Combine 🌊 Lake and 🌊 Lake to create 🌊 Ocean

Step 11: 🌼 Dandelion and 🐊 Swamp

Combine 🌼 Dandelion and 🐊 Swamp to create 🐸 Frog

Step 12: 🚗 Engine and 🚗 Engine

Combine 🚗 Engine and 🚗 Engine to create 🚀 Rocket

Step 13: 🏄 Surf and 💨 Smoke

Combine 🏄 Surf and 💨 Smoke to create 🏄 Surfer

Step 14: 🐸 Frog and 🌊 Ocean

Combine 🐸 Frog and 🌊 Ocean to create 🐢 Turtle

Step 15: 🏄 Surfer and 🚀 Rocket

Combine 🏄 Surfer and 🚀 Rocket to create 🤖 Iron Man

Step 16: 🤖 Iron Man and 🐢 Turtle

Combine 🤖 Iron Man and 🐢 Turtle to create 🐢 Iron Turtle