Mariupol is an expansion for "Battles of XXI Century" ("Bitwy XXI Wieku") system - you get board, tables and counters and two scenarios but the core game is needed, because you need the rule book and help counters. This is not a stand alone game. War of Ships is the stand alone game, with board, counters, rules, tables and three scenarios. The game was published in issue 40 of Taktyka i Strategia (Tactics and Strategy) magazine in both Polish and English editions. Scenarios are included for the following games: Kursk 1943 (2 scenarios) Battles of XXI Century (4 scenarios, including two for Mariupol and two for core game) Battles of the II WW (two scenarios and 2 for Mokra 1939) Crecy (two scenarios) Borodino 1812 (one scenario) ASL Starter Kits 1-3 (two scenarios)