diff --git a/canvas/src/lib.rs b/canvas/src/lib.rs
index 3fbd82d..c33b7c7 100644
--- a/canvas/src/lib.rs
+++ b/canvas/src/lib.rs
@@ -1,4 +1,6 @@
 #![allow(dead_code)]
+use std::default;
+
 use crate::objective::Objective;
 
 mod card;
@@ -15,7 +17,7 @@ struct Shop {
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-enum Icon {
+pub enum Icon {
     Circle,
     Square,
     Triangle,
@@ -47,9 +49,34 @@ struct Board {
     objectives: [CriteriaCard; 4],
 }
 
+#[derive(Debug, Clone, Copy, Default)]
+struct PointThresholds(u32);
+
+impl PointThresholds {
+    const BITFIELD_SIZE: usize = 4;
+    pub fn len(&self) -> usize {
+        (self.0.ilog2() as usize).div_ceil(Self::BITFIELD_SIZE)
+    }
+    pub fn new(points: &[u8]) -> Self {
+        let mut result = Self(0);
+        for (index, p) in points.iter().enumerate() {
+            result.set(index, *p);
+        }
+        result
+    }
+    fn set(&mut self, index: usize, value: u8) {
+        debug_assert!(value < (1 << Self::BITFIELD_SIZE));
+        self.0 |= u32::from(value) << (index * Self::BITFIELD_SIZE);
+    }
+    pub fn get(&self, index: usize) -> u8 {
+        let bitmask = (1u8 << Self::BITFIELD_SIZE) - 1;
+        (self.0 >> (index * Self::BITFIELD_SIZE)) as u8 & bitmask
+    }
+}
+
 #[derive(Debug)]
 struct CriteriaCard {
     objective: Objective,
     // Points depending on how often the criteria was met
-    points: Vec<u8>,
+    points: PointThresholds,
 }
diff --git a/canvas/src/objective.rs b/canvas/src/objective.rs
index 2ac95ac..31bf866 100644
--- a/canvas/src/objective.rs
+++ b/canvas/src/objective.rs
@@ -5,9 +5,9 @@ use crate::{Icon, Painting, icon_bitfield::IconBitfield};
 pub enum Objective {
     AllFields,
     /// Must use every icon in the vector at least once
-    IconsUsed(Vec<Icon>),
+    IconsUsed(IconSet),
     /// The count of all icons in the vec `.0` combined is exactly `.1`
-    ExactlyNIcons((Vec<Icon>, u8)),
+    ExactlyNIcons((IconSet, u8)),
     /// These icons are in fields exactly next to each other
     /// One icon can only be the neighbor of one other icon
     Neighbors(Vec<(Icon, Icon)>),
@@ -15,6 +15,58 @@ pub enum Objective {
     DistantNeighbors(Vec<(Icon, Icon)>),
     NInARow(Icon, u8),
 }
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct IconSet(u8);
+const ICON_SET_ORDER: [Icon; 4] = [Icon::Circle, Icon::Triangle, Icon::Square, Icon::Color];
+
+pub struct IconSetIterator {
+    icon_set: IconSet,
+    index: u8,
+}
+
+impl From<&[Icon]> for IconSet {
+    fn from(value: &[Icon]) -> Self {
+        let v = value
+            .iter()
+            .map(|x| 1 << ICON_SET_ORDER.iter().position(|v| x == v).unwrap())
+            .fold(0, |a, b| a | b);
+        Self(v)
+    }
+}
+
+impl IconSet {
+    pub fn len(&self) -> usize {
+        self.0.count_ones() as usize
+    }
+}
+
+impl Iterator for IconSetIterator {
+    type Item = Icon;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        while self.index < 4 {
+            let old_index = self.index;
+            self.index += 1;
+
+            if self.icon_set.0 & (1 << old_index) != 0 {
+                return Some(*ICON_SET_ORDER.get(old_index as usize).unwrap());
+            }
+        }
+        None
+    }
+}
+
+impl IntoIterator for IconSet {
+    type Item = Icon;
+    type IntoIter = IconSetIterator;
+
+    fn into_iter(self) -> Self::IntoIter {
+        IconSetIterator {
+            icon_set: self,
+            index: 0,
+        }
+    }
+}
 
 impl Objective {
     pub fn count_matches(&self, painting: &Painting) -> u8 {
@@ -28,7 +80,7 @@ impl Objective {
             }
             Objective::IconsUsed(icons) => {
                 let bits = IconBitfield::from_painting(painting);
-                if icons.iter().all(|i| bits.get_icon_bits(*i) > 0) {
+                if icons.into_iter().all(|i| bits.get_icon_bits(i) > 0) {
                     1
                 } else {
                     0
@@ -38,8 +90,8 @@ impl Objective {
                 let bits = IconBitfield::from_painting(painting);
 
                 if icons
-                    .iter()
-                    .map(|i| bits.get_icon_bits(*i).count_ones())
+                    .into_iter()
+                    .map(|i| bits.get_icon_bits(i).count_ones())
                     .sum::<u32>() as u8
                     == *count
                 {
@@ -70,7 +122,10 @@ impl Objective {
 
 #[cfg(test)]
 mod tests {
-    use crate::{Card, Painting, objective::Objective};
+    use crate::{
+        Card, Icon, Painting,
+        objective::{IconSet, Objective},
+    };
 
     #[test]
     fn test_all_fields() {
@@ -89,18 +144,37 @@ mod tests {
             Card::from_dbg_string("ll..."),
             Card::from_dbg_string("..t.."),
         ];
-        assert_eq!(
-            Objective::NInARow(crate::Icon::Color, 2).count_matches(&v),
-            2
-        );
+        assert_eq!(Objective::NInARow(Icon::Color, 2).count_matches(&v), 2);
         let tricky_two: Painting = [
             Card::from_dbg_string("...ll"),
             Card::from_dbg_string("tl..."),
             Card::from_dbg_string("..lc."),
         ];
         assert_eq!(
-            Objective::NInARow(crate::Icon::Color, 2).count_matches(&tricky_two),
+            Objective::NInARow(Icon::Color, 2).count_matches(&tricky_two),
             2
         );
     }
+
+    #[test]
+    fn test_icons_used() {
+        let v: Painting = [
+            Card::from_dbg_string("...ll"),
+            Card::from_dbg_string("ll..."),
+            Card::from_dbg_string("..t.."),
+        ];
+
+        assert_eq!(
+            Objective::IconsUsed(IconSet::from([Icon::Color].as_slice())).count_matches(&v),
+            1
+        );
+        assert_eq!(
+            Objective::IconsUsed(IconSet::from([Icon::Triangle].as_slice())).count_matches(&v),
+            1
+        );
+        assert_eq!(
+            Objective::IconsUsed(IconSet::from([Icon::Circle].as_slice())).count_matches(&v),
+            0
+        );
+    }
 }