Season 1 Twists: Player 001 (Oh Il-nam) is not a helpless old man, but the billionaire creator and host of the games who joined for a final thrill before dying of a brain tumor. Cho Sang-woo commits suicide in the final round so Gi-hun can win the ₩45.6 billion prize.
Season 2 Twists: Gi-hun chooses not to fly to America to see his daughter, re-entering the game to stage a rebellion. He discovers the guards have introduced an 'OX' voting mechanic after every game to divide players. His armed rebellion at the end of Season 2 fails due to player betrayals, resulting in the death of his closest ally, Jung-bae.
Season 3 & Series Finale Twists: Pregnant player Kim Jun-hee gives birth during the games. In the final deadly round ("Sky Squid Game"), Gi-hun faces off against player Myung-gi to protect the newborn. Gi-hun sacrifices his own life so the newborn baby officially wins the grand prize. Moved by Gi-hun’s selfless death, the Front Man (Hwang In-ho) personally delivers the prize money to Gi-hun’s daughter in Los Angeles. However, the series closes with In-ho witnessing a new American recruiter playing ddakji with a homeless man in an LA alley, confirming the game's ongoing global expansion.