LumiKin
Undecember

Review · Action · Android · PC · iOS

Undecember

By the LumiKin editors

Reviewed: 17 May 2026

Android · PC · iOS

LINE Games · 2022

LumiScore

53/100

Good

Growth (BDS)

62

Risk (RIS)

53

Daily limit

60min

Age guidance

M

Developmental benefits

B1Cognitive
0.76
B2Social-emotional
0.43
B3Motor
0.55

Undecember offers a deep and engaging action RPG experience with unparalleled freedom in character building and skill customization. Players can explore a vast world, tackle challenging cooperative boss raids, and join guilds, fostering strategic thinking, creativity, and teamwork.

Design risks

R1Dopamine pressure
0.67
R2Monetization
0.50
R3Social risk
0.33

While offering significant freedom and depth, Undecember employs common free-to-play mechanics that can encourage continuous engagement and spending. These include variable rewards, limited-time events, and progression systems that may create pressure to play and spend to keep up. The game's M rating indicates mature content, including significant violence.

Heads up

  • Monthly spendTypical real-money spend by engaged players: $0–100/mo.
Avg playtime~2 hReviewedMay 2026How scores are calculated →

Parents ask…

Is Undecember safe for kids?

LumiKin gives Undecember a LumiScore of 53/100. It offers solid benefits but needs parental guidance on the risks.

How long should kids play Undecember?

LumiKin's recommended play time for Undecember is Up to 1 hour/day, calibrated to the game's dopamine, monetization, and social-pressure profile.

What are the main risks of Undecember?

While offering significant freedom and depth, Undecember employs common free-to-play mechanics that can encourage continuous engagement and spending. These include variable rewards, limited-time events, and progression systems that may create pressure to play and spend to keep up. The game's M rating indicates mature content, including significant violence.