# I have a MapGame with abstract .spawn_players method, MapGame_FreeForAll(MapGame) and MapGame_TeamBased(MapGame)

class MapGame(BaseGame):
    stage_groups = {
        'game-start': ["spawn-players"],
        'game-end': ["send-some-message", "destroy"],
    }

    # I'll skip send-some-message and destroy stages as they're unrelated

    @stage('spawn-players')
    def spawn_players(self):
        raise NotImplementedError

class MapGame_FreeForAll(MapGame):
    @stage('spawn-players')
    def spawn_players(self):
        spawnpoints = list(self.spawnpoints)
        for player in self.players:
            teleport_to_spawnpoint(spawnpoints.pop(0))


class MapGame_TeamBased(MapGame):
    @stage('spawn-players')
    def spawn_players(self):
        spawnpoints_team1 = list(self.spawnpoints_team1)
        spawnpoints_team2 = list(self.spawnpoints_team2)

        for player in self.players_team1:
            teleport_to_spawnpoint(spawnpoints_team1.pop(0))

        for player in self.players_team2:
            teleport_to_spawnpoint(spawnpoints_team2.pop(0))


# Then I have a SurvivalGame_FreeForAll and SurvivalGame_TeamBased that inherit from SurvivalGame
class SurvivalGame_FreeForAll(SurvivalGame):
    pass
    # Some methods specific to SurvivalGame_FreeForAll

class SurvivalGame_TeamBased(SurvivalGame):
    pass
    # Some methods specific to SurvivalGame_TeamBased


# And here goes SurvivalGame itself
# Now to the funny part - survival games require setting damage hooks - that's another stage
class SurvivalGame(??????????????):     # I'll skip inheritance for this class
    stage_groups = {
        'game-start': ["spawn-players", "setup-damage-hooks"]   # Note how game-start stage is altered,
                                                                # but the stage_groups dict still retains
                                                                # original "game-end" stage untouched
    }
    @stage('setup-damage-hooks')
    def setup_damage_hooks(self):
        for player in self.player:
            setup_damage_hook(player)