diff --git a/src/game/mod.rs b/src/game/mod.rs
index 2d8ad78..61e02e3 100644
--- a/src/game/mod.rs
+++ b/src/game/mod.rs
@@ -1 +1,2 @@
 pub mod deck;
+pub mod playerbuilder;
diff --git a/src/game/playerbuilder.rs b/src/game/playerbuilder.rs
new file mode 100644
index 0000000..e7ce89d
--- /dev/null
+++ b/src/game/playerbuilder.rs
@@ -0,0 +1,31 @@
+use crate::game::deck::Deck;
+
+/// Player Builder, which allows the adding of new players.
+pub struct PlayerBuilder {
+    players: Vec<Deck>,
+}
+
+/// A fixed set of players that cannot grow - occurs once players have been
+/// picked.
+pub type FixedPlayers = Box<[Deck]>;
+
+impl PlayerBuilder {
+    /// Construct a new player builder.
+    pub fn new() -> Self {
+        Self {
+            players: Vec::new(),
+        }
+    }
+
+    /// Add a new player with an empty deck to the builder, returning its ID.
+    pub fn add(&mut self) -> usize {
+        let id = self.players.len();
+        self.players.push(Deck::new_empty());
+        id
+    }
+
+    /// Fix the current number of players for later game stages.
+    pub fn into_fixed(self) -> FixedPlayers {
+        self.players.into_boxed_slice()
+    }
+}