Super Mario Bros.
Fair
Addictive design
Deluxe editions, pre-orders and re-releasesGame library subscriptionPay once (premium)
All games
52 games
Team Fortress 2
HarmfulFree
Addictive design
Loot boxes (paid random items)Free-to-play with in-app purchasesReal-money trading and token exchangesCosmetic-only purchasesSkin betting and third-party gambling sitesManufactured scarcity and grind
Tetris (Game Boy)
Fair
Addictive design
Deluxe editions, pre-orders and re-releasesGame library subscriptionPay once (premium)
World of Warcraft
Caution
Addictive design
Real-money trading and token exchangesDeluxe editions, pre-orders and re-releasesMonthly subscription (one game)Cosmetic-only purchasesShareware and free demosExpansion packs+3