Doomsday Engine

Many of the supported games are variants of some other supported game. Therefore, games should form a hierarchy so that one can refer to multiple games by using the common parent game's identity key.

A hierarchy like this allows modelling the relationships between extended games and variant games

• doom
  • 1
    • ultimate
  • 2
    • tnt
    • plutonia
• heretic
  • serpentriders
• hexen
  • 1.0
  • 1.1
    • dk

Note that game::Game already supports specifying a "variant of" identifier for each game.