New Browser Game “I’ve Been Killing Slimes for 300 Years and Maxed Out My Level: Witchcraft” Now Available on G123.CTW Inc. has officially launched the first-ever browser game adaptation of the popular series “I’ve Been Killing Slimes for 300 Years and Maxed Out My Level” on the G123 platform.
CTW Inc. is excited to announce the official launch of G123’s latest game, “I’ve Been Killing Slimes for 300 Years and Maxed Out My Level: Witchcraft.”
Play Now: https://s.g123.jp/irv812qx
Enjoy the new “I’ve Been Killing Slimes for 300 Years” game on both smartphone and PC!
Based on the hit anime, this beloved series is now a game for the very first time! Dive into a laid-back, fluffy battle RPG—”I’ve Been Killing Slimes for 300 Years and Maxed Out My Level: Witchcraft” officially launches today!
Play Now: https://s.g123.jp/irv812qx
In addition, the official service launch trailer has been released on the G123 official YouTube channel. Be sure to check it out!
Watch the video on YouTube: https://youtu.be/59ktWI13Pnw
Start now and get up to $700 worth of in-game items! Launch Celebration Event Now Live!
To celebrate the official release of “SlimeWitch300”, a luxurious Start Dash Event is currently underway! Log in daily, complete quests, and progress through the game to earn a wide variety of rewards. Within just 30 minutes of play, you’ll recruit Laika to your party.
And in just 3 days, you can earn up to $700 worth of items! Don’t miss this chance—start “SlimeWitch300” now and kick off your adventure in the best way possible!
Play Now: https://s.g123.jp/irv812qx
New Game Release! Giveaway Event!
The official launch of “I’ve Been Killing Slimes for 300 Years and Maxed Out My Level: Witchcraft” is here! To celebrate, we’re holding a special Amazon Gift Card Giveaway! The more you enter, the higher your chances of winning!
Event Prizes
Amazon Gift Card $10 x 10 winners in total
Event Period
Event Period: 7/9 11:00 up to 7/31 23:59 (UTC+9)
Winner Announcement: 8/5 12:00 (UTC+9)
Event URL
Official X: https://x.com/slacra_en
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. It’s an HTML5 game you can enjoy right from your smartphone, tablet, or PC browser—no downloads required! With full idle features, you can play your way: grind at home on PC, or level up casually on mobile anytime.
Play Now: https://s.g123.jp/uljpkd4m
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.
What is G123?
G123 is Japan’s leading HTML5 game service, providing high quality games based on popular Japanese anime franchises. G123’s exclusive games can be played on mobile, tablet or web browser, with no download or registration required. Games already available in English on the platform include the popular titles Queen’s Blade Limit Break, High School D×D Operation Paradise Infinity, Arifureta: From Commonplace to World’s Strongest – Rebellion Soul and So I’m a Spider, So What? Ruler of the Labyrinth.
Official Site: https://g123.jp/?lang=en
About CTW
CTW is the company behind the G123 gaming platform.
Media Contact
Organization: CTW INC.
Contact Person: Issei Gomi
Website: https://g123.jp/?lang=en
Email: Send Email
Contact Number: +815017486333
Address:Ark Hills Sengokuyama Mori Tower 29F
Address 2: 1-9-10 Roppongi
City: Minato-ku
State: Tokyo
Country:Japan
Release id:30521
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New Game Release Ive Been Killing Slimes for 300 Years and Maxed Out My Level Witchcraft is now live on G123
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