The decision to host a game is always available
The decision to invite a player to the game becomes available when the game is created.
The decision to accept an invitation becomes available when a player has been invited. It is unavailable when they have accepted
The decision to leave the lobby becomes available when the player has joined the lobby. It is unavailable when they have left
The decision to start the game becomes available when at least one player has joined.
The decision to occupy a country becomes available when it is the players turn and territories are available.
The decision to reinforce a territory becomes available when it is the players turn and there are units to reinforce with (setup stage, one unit at a time)
The decision to fortify a territory becomes available when it is the players turn and there are no more territories to occupy (setup stage, one unit at a time)
The decision to play a risk card becomes available when it is the players turn. It is unavailable once they start to reinforce
The decision to reinforce a territory becomes available when it is the players turn and there are units to reinforce with. It is unavailable when they decide to attack
The decision to attack becomes available when it is the players turn and there are no more units to reinforce with. It unavailable when they decide to fortify
The decision to fortify becomes available when the player has finished attacking. It unavailable when they decide to end their turn