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Number 21 - Death Deal

Review · Strategy · PC

Number 21 - Death Deal

Reviewed: 17 Jun 2026

PC

CutterKnight · 2026

Ludograph rating

C

Mixed

47 /100

Automated review
06010030Benefit →Low risk →B 32 · R 9
The Ludograph reading, plotted from the published benefit and risk sub-scores.

Growth (BDS)

32

Risk (RIS)

9

Daily limit

120min

Age guidance

13+

Developmental benefits

B1Cognitive
0.58
B2Social-emotional
0.00
B3Motor
0.15

Number 21 - Death Deal is a psychological horror card game that significantly challenges cognitive skills. Players must employ strategic and critical thinking, problem-solving, and memory to navigate evolving rules and make calculated decisions under pressure. The game's adaptive challenge ensures continuous engagement and mental stimulation.

Design risks

R1Compulsion-loop pressure
0.20
R2Monetization
0.00
R3Social risk
0.00

The primary risks in Number 21 - Death Deal stem from its psychological horror content, which includes intense fear and unsettling themes. The game features implied violence and dire consequences for failure, which may be disturbing for some players. While monetization and social risks are minimal, the game's design incorporates elements of loss aversion and variable rewards, which can contribute to engagement but are not overly manipulative.

Content (not in risk score)

R4.1Violence Level
0.67
R4.2Sexual Content
0.00
R4.3Language
0.00
R4.4Substance References
0.00
R4.5Fear / Horror
1.00

Content risk is displayed separately and does not affect the time recommendation.

Regulatory design checks · DSA — Assessed: meets criteria·GDPR-K — Assessed: meets criteria·ODDS — Assessed: meets criteria

  • DSA:What Ludograph checks: whether the game's design gives minors the transparency the EU Digital Services Act expects: plain terms, honest defaults, and clear reporting routes.: Estimated from review data. No dark pattern or child-targeting concerns found.
  • GDPR-K:What Ludograph checks: whether age assurance and consent flows are designed for under-16s, in the spirit of GDPR Article 8.: Estimated from review data. No privacy or child-targeting concerns found.
  • ODDS:What Ludograph checks: whether paid random-reward drop rates are disclosed, as required in China, Japan and South Korea.: Estimated from review data. No paid random-reward mechanics found, so drop-rate disclosure requirements do not apply.

These reflect Ludograph's assessment of the game's design practices against each framework's criteria, not a legal compliance determination.

ReviewedJun 2026Report a data error →How scores are calculated →

Parents ask…

Is Number 21 - Death Deal safe for kids?

Ludograph gives Number 21 - Death Deal a rating of 47/100, recommended for ages 13 and up. It delivers genuine benefits but carries design risks that deserve a close look.

What age is Number 21 - Death Deal appropriate for?

Ludograph's rubric recommends a minimum age of 13+ for Number 21 - Death Deal, based on benefits, risks, and content review.

How long should kids play Number 21 - Death Deal?

Our session recommendation for Number 21 - Death Deal is up to 120 minutes per day. It is derived from the game's own structure (natural stopping points, compulsion-loop design, monetization pressure, and social dynamics), not from a universal screen-time dose.

Session recommendations are design-based heuristics. Evidence linking specific daily durations to child outcomes is limited, and context matters as much as time; treat this as a starting point for household rules, not a clinical threshold.

What are the main risks of Number 21 - Death Deal?

The primary risks in Number 21 - Death Deal stem from its psychological horror content, which includes intense fear and unsettling themes. The game features implied violence and dire consequences for failure, which may be disturbing for some players. While monetization and social risks are minimal, the game's design incorporates elements of loss aversion and variable rewards, which can contribute