Games

Lord of Tempest
That Time I Got Reincarnated as a Slime: Lord of Tempest (転生したらスライムだった件 ～魔国連邦創世記～) is a Japanese mobile game based on the series.

Characters from the series have also appeared in Seven Deadly Sins: Hikari to Yami no Grand Cross in a collaboration event.

Rimuru, Shizu, Shuna and Milim have appeared in SINoALICE in a collaboration event.

ISEKAI Memories
That Time I Got Reincarnated as a Slime: ISEKAI Memories (転生したらスライムだった件：魔王と竜の建国譚), also known as That Time I Got Reincarnated as a Slime: The Saga of How the Demon Lord and Dragon Founded a Nation, is an upcoming Japanese mobile game based on the series. It is a Nation Building 3D Battle RPG where players can build their own nation and recreate the anime's story as well as an original storyline supervised by Fuse.

Official Download: English Official Download: Japanese

Unofficial: Tensura Mod
Tensura Mod is a work-in-progress Minecraft mod made by MinhEragon. Tensura Mod is a fantasy-themed mod that is based on this series. The mod is currently playable on version 1.16.5 and is actively being improved by the author.

Check out the wiki: https://tensura-mod.fandom.com/wiki/Tensura_Mod_Wiki