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 though development on the 1.16.5 version has stopped as the Final Update was released on the 28th of September, 2021.

However Minh and the team of admins have confirmed 'Tensura: Reincarnated' which will be a remake of the mod.

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