Ren and Rak enter the Tower in the latest patch of Tower of God: New World. The update is already available on all platforms.
Trevor Wells says; "Tower of God: New World is a Role-playing game developed by Netmarble. The game centers around the main character Bam as he climbs the Tower."
Tower of God: New World is a mobile RPG game published by Netmarble and based on the popular Webtoon series of the same name. In the game, players take on the role of a Regular trying to climb the Tower of God. The Tower is a mysterious place with many challenges, but it also rewards those who reach the top. Players must collect and train characters, develop their skills and battle through the Tower.
it's an idle game, not much to play with. Just improve your status, learn each character's abilities and set up a good enough team to move forward (in auto mode).
That said, it's been entertaining me so far and after watching the season 1 and trying to read the comic, this is by far the prettiest way to follow Tower of God's story (no idea why Crunchyroll made the anime almost as ugly as the comic)