"I've Been Killing Slimes for 300 Years and Maxed Out My Level: Witchcraft" Early Access Event Announced!

5,000 lucky pre-registrants will be invited to play early!

CTW Inc. is excited to announce an Early Access Event for the upcoming G123 title "I've Been Killing Slimes for 300 Years and Maxed Out My Level: Witchcraft." Players who pre-register will have a chance to be selected for early access before the official release.

Pre-register Now

[Event Period]
From 7/9 (Wed) until the game’s official release

[Players Selected]
5,000

[Eligibility]
Priority given to users who pre-register by 7/9 (Wed)

■ How to Pre-Register

You can pre-register for "SlimeWitch300" using the following methods:

Register via the official game page

Follow the official X (formerly Twitter) account

■ 100,000 Pre-Registrations Reached! Get 200 Gacha Pulls + “Laika” at Launch!

As a reward for hitting 100,000 pre-registrations, all players will receive 200 free gacha pulls, Laika, 2,025 Gems, and more when the game launches! Pre-registration is still open—don’t miss your chance to join early and claim these exclusive launch rewards!

Pre-register Now

■ A Chill Battle RPG Where You Level Up with Family!

This is the first browser game adaptation of "I've Been Killing Slimes for 300 Years and Maxed Out My Level." But this time, Azusa has mysteriously returned to Level 1…!? 

Visit iconic locations from the anime and help Azusa become the strongest "Witch of the Highlands" once again!

"SlimeWitch300" is available only on the G123 platform. This HTML5 game can be played directly on your smartphone, tablet, or PC browser no downloads required! With robust idle features, you can grind at home on your PC or play casually on mobile while on the go. Stay tuned the game is coming soon!

■ Game Info

Game Title: I've Been Killing Slimes for 300 Years and Maxed Out My Level: Witchcraft
Genre: Laid-back Battle RPG
Price: Free to play (in-game item purchases available)

■ What is "I've Been Killing Slimes for 300 Years and Maxed Out My Level"?

Based on the light novel by Kisetsu Morita, the series has sold over 3 million copies to date. It was adapted into a TV anime in April 2021, with Season 2 airing in April 2025. This beloved isekai (another world reincarnation) series features adorable characters and a relaxing, fluffy world that fans can’t get enough of.

Its heartwarming slice-of-life storytelling and lovable cast have made it a fan favorite, leading to multiple manga adaptations and spin-offs. A true gem of the slow-life comedy genre.

©Kisetsu Morita-SB Creative Corp./slime300 project2
©CTW, INC. All rights reserved.

*All other company names and product names mentioned are trademarks or registered trademarks of their respective owners.