diff --git a/server/src/img.rs b/server/src/img.rs
index 75b0d95f..d9309323 100644
--- a/server/src/img.rs
+++ b/server/src/img.rs
@@ -43,8 +43,8 @@ pub fn invader_write(id: Uuid) -> Result<Uuid, Error> {
     let mut colours = std::iter
         ::repeat_with(|| {
             let h = rng.gen_range(0, 360);
-            let s = s_dist.sample(&mut rng) as u16;
-            let l = l_dist.sample(&mut rng) as u16;
+            let s = s_dist.sample(&mut rng) as usize;
+            let l = l_dist.sample(&mut rng) as usize;
             format!("hsl({:}, {:}%, {:}%)", h, s, l)
         })
         .take(3)
@@ -201,7 +201,7 @@ mod tests {
 
 // -    let actions = mode_drops(mode);
 // +    let log_normal = LogNormal::new(1.0, 1.0);
-// +    let num_drops = log_normal.sample(&mut rng).floor() as u16;
+// +    let num_drops = log_normal.sample(&mut rng).floor() as usize;
 // +
 // +    println!("{:?} drops", num_drops);
 
diff --git a/server/src/instance.rs b/server/src/instance.rs
index 3061cb10..57bc00aa 100644
--- a/server/src/instance.rs
+++ b/server/src/instance.rs
@@ -403,6 +403,8 @@ impl Instance {
             None => return Ok(self.finish()),
         };
 
+        let bits = 12 + 6 * self.rounds.len();
+
         {
             let loser = self.players.iter()
                 .find(|p| p.id != winner_id)
@@ -414,6 +416,7 @@ impl Instance {
                 .unwrap();
 
             winner.score = winner.score.add_win(&loser);
+            winner.vbox.balance_add(bits.into());
         }
 
         {
@@ -422,6 +425,7 @@ impl Instance {
                 .unwrap();
 
             loser.score = loser.score.add_loss();
+            loser.vbox.balance_add(bits.into());
         }
 
         if self.all_games_finished() {
diff --git a/server/src/item.rs b/server/src/item.rs
index a2d4b5cf..55c883f9 100644
--- a/server/src/item.rs
+++ b/server/src/item.rs
@@ -306,7 +306,7 @@ impl Item {
         }
     }
 
-    pub fn cost(&self) -> u16 {
+    pub fn cost(&self) -> usize {
         match self {
             Item::Red => 1,
             Item::Green => 1,
diff --git a/server/src/mtx.rs b/server/src/mtx.rs
index 81aeadbe..e71a481b 100644
--- a/server/src/mtx.rs
+++ b/server/src/mtx.rs
@@ -36,7 +36,7 @@ pub struct Shop {
 #[derive(Debug,Copy,Clone,PartialEq,Serialize,Deserialize)]
 pub struct Listing {
     variant: MtxVariant,
-    credits: u16,
+    credits: usize,
 }
 
 #[derive(Debug,Copy,Clone,PartialEq,Serialize,Deserialize)]
diff --git a/server/src/player.rs b/server/src/player.rs
index 8c42743d..5f6b3259 100644
--- a/server/src/player.rs
+++ b/server/src/player.rs
@@ -12,7 +12,7 @@ use vbox::{Vbox};
 use item::{Item, ItemEffect};
 use effect::{Effect};
 
-const DISCARD_COST: u16 = 2;
+const DISCARD_COST: usize = 2;
 
 #[derive(Debug,Copy,Clone,Serialize,Deserialize,Eq,PartialEq)]
 pub enum Score {
diff --git a/server/src/vbox.rs b/server/src/vbox.rs
index 4e2e1a96..7088d0e9 100644
--- a/server/src/vbox.rs
+++ b/server/src/vbox.rs
@@ -21,7 +21,7 @@ use item::*;
 
 #[derive(Debug,Clone,Serialize,Deserialize)]
 pub struct Vbox {
-    pub bits: u16,
+    pub bits: usize,
     pub free: Vec<Vec<Option<Item>>>,
     pub bound: Vec<Item>,
 }
@@ -47,7 +47,7 @@ impl Vbox {
         }
     }
 
-    pub fn balance_sub(&mut self, amount: u16) -> Result<&mut Vbox, Error> {
+    pub fn balance_sub(&mut self, amount: usize) -> Result<&mut Vbox, Error> {
         let new_balance = self.bits
             .checked_sub(amount)
             .ok_or(format_err!("insufficient balance: {:?}", self.bits))?;
@@ -57,7 +57,7 @@ impl Vbox {
         Ok(self)
     }
 
-    pub fn balance_add(&mut self, amount: u16) -> &mut Vbox {
+    pub fn balance_add(&mut self, amount: usize) -> &mut Vbox {
         self.bits = self.bits.saturating_add(amount);
         self
     }