Wonder Boy in Monster Land is a 1988 Master System game from Westone, originally released in arcades in 1987, catalogued here for 7 defining game mechanics.
Wonder Boy in Monster Land is a platform game developed by Westone and released by Sega in arcades (1987) and on the Master System (1988). (via Wikipedia)
The genre Wonder Boy in Monster Land helped define
Action-RPG platformer. Fused platforming with shops, gear, and leveling, seeding the RPG-platformer hybrid.
The game mechanics of Wonder Boy in Monster Land
Scrolling MovementTraversalWorld scrolls in one or two axes as the player moves or time passes; player exists within an advancing boundary.
Boss EncounterCombatA single high-health enemy with unique scripted behavior and distinct phases serves as a gated progress challenge.
Contact DamageCombatTouching an enemy or environmental hazard deals damage to the player without any explicit attack trigger from either party.
Real Time Action CombatCombatCombat resolves continuously in real time; player inputs compete directly with enemy behavior each frame.
Economy Buy SellResourcePlayer earns and spends currency at merchants; price and value decisions are meaningful.
Level Up StatsProgressionDefeating enemies or completing tasks accumulates points; reaching thresholds permanently increases player stats.
Permanent PowerupProgressionAcquiring an item or ability permanently increases a player capability that persists through death and save/load.
Each mechanic links to how to build it in Godot, with the retro games that share it.