For Ocean Survival, I Can Synthesize and Upgrade!

Overnight, the world turned into an ocean survival game. In this game, sea beasts are rampant and monsters fly. Lin Feng got it, the synthetic upgrade system! He can synthesize or upgrade various supplies into various equipment and materials! "Ding, rubber T-sleeves can be synthesized and upgraded into rubber boats!" "Ding, the rusty harpoon can be upgraded to a fishing crossbow!" "Ding, wooden fishing boats can be synthesized and upgraded into small warships!" "Ding, your battleship 'Dongfeng' has been upgraded to a large battleship!" "Ding, congratulations on becoming the supreme lord of the sea area, you can recruit +100,000 people!" "Ding, you have been listed as the most wanted target in the game!" "Ding, your bounty is as high as 10 billion game coins!" "Ding, you have become a bug in the game and are about to transform into the Poseidon!" Gradually, Lin Feng became a god-like master in this game! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.