diff --git a/components/CompletedMission.vue b/components/CompletedMission.vue
new file mode 100644
index 0000000..2577624
--- /dev/null
+++ b/components/CompletedMission.vue
@@ -0,0 +1,20 @@
+<template>
+  <div class="rounded-lg border text-center py-1">
+    {{ mission.name }}
+  </div>
+</template>
+
+<script>
+export default {
+  props: {
+    mission: { type: Object, required: true },
+  },
+}
+</script>
+
+<style scoped>
+div {
+  border-color: currentColor;
+  background-color: rgba(0, 0, 0, 0.1);
+}
+</style>
diff --git a/components/MissionButton.vue b/components/MissionButton.vue
index de7bfdc..6754c75 100644
--- a/components/MissionButton.vue
+++ b/components/MissionButton.vue
@@ -4,8 +4,8 @@
     :description="mission.description"
     :max="max"
     :value="value"
-    :unit="unit"
-    @click="complete"
+    :unit="mission.completionCriteria.unit"
+    @click="$emit('click')"
   />
 </template>
 
@@ -16,22 +16,21 @@ export default {
   },
   computed: {
     value() {
-      return 'cost' in this.mission.completionCriteria
-        ? this.$store.state.currency
-        : this.$store.state.playerAge
+      const { unit } = this.mission.completionCriteria
+
+      if (unit === 'maxAge') {
+        return this.$store.state.playerAge
+      } else if (unit === 'spareTime') {
+        return this.$store.state.currency
+      } else {
+        //  (unit === 'apprenticeLevels')
+        return this.$store.getters.apprenticeLevels
+      }
     },
     max() {
-      return 'cost' in this.mission.completionCriteria
-        ? this.mission.completionCriteria.cost
-        : this.$store.state.playerAgeMax
-    },
-    unit() {
-      return 'cost' in this.mission.completionCriteria ? 'spareTime' : 'age'
-    },
-  },
-  methods: {
-    complete() {
-      this.$store.commit('completeMission', this.mission)
+      return this.mission.completionCriteria.unit === 'maxAge'
+        ? this.$store.state.playerAgeMax
+        : this.mission.completionCriteria.value
     },
   },
 }
diff --git a/pages/Missions.vue b/pages/Missions.vue
index e25a949..f7387c1 100644
--- a/pages/Missions.vue
+++ b/pages/Missions.vue
@@ -1,9 +1,80 @@
 <template>
-  <responsive-grid>
-    <mission-button
-      v-for="(mission, index) in $store.state.missions"
-      :key="index"
-      :mission="mission"
-    />
-  </responsive-grid>
+  <div class="missions grid">
+    <responsive-grid
+      v-if="incomplete.length"
+      :class="
+        completed.length &&
+        `pb-6 border-b-2 border-${$store.getters.activeTab.darkColor}`
+      "
+    >
+      <mission-button
+        v-for="(mission, index) in incomplete"
+        :key="index"
+        :mission="mission"
+        @click="complete(mission)"
+      />
+    </responsive-grid>
+
+    <div
+      v-else
+      :class="
+        completed.length &&
+        `pt-6 pb-10 border-b-2 border-${$store.getters.activeTab.darkColor}`
+      "
+    >
+      <h3 class="text-center">No Missions Currently Available</h3>
+    </div>
+
+    <template v-if="completed.length">
+      <h2 class="pt-2 pb-2 text-center text-xl">Completed Missions</h2>
+      <responsive-grid min="1" mid="3" max="6">
+        <completed-mission
+          v-for="(mission, index) in completed"
+          :key="index"
+          :mission="mission"
+        />
+      </responsive-grid>
+    </template>
+  </div>
 </template>
+
+<script>
+export default {
+  computed: {
+    unlocked() {
+      return this.$store.state.missions.filter(({ unlockCriteria }) => {
+        if (unlockCriteria.unit === 'instruments') {
+          return unlockCriteria.value <= this.$store.getters.instruments
+        } else if (unlockCriteria.unit === 'apprenticeLevels') {
+          return unlockCriteria.value <= this.$store.getters.apprenticeLevels
+        } else if (unlockCriteria.unit === 'missionsCompleted') {
+          return unlockCriteria.value.every((name) =>
+            this.$store.getters.missionIsCompleted(name)
+          )
+        } else if (unlockCriteria.unit === 'timeJumpsBackwards') {
+          return unlockCriteria.value <= this.$store.state.timeJumpsBackwards
+        } else {
+          return false
+        }
+      })
+    },
+    incomplete() {
+      return this.unlocked.filter((m) => !m.complete)
+    },
+    completed() {
+      return this.unlocked.filter((m) => m.complete)
+    },
+  },
+  methods: {
+    complete(mission) {
+      this.$store.commit('completeMission', mission.name)
+    },
+  },
+}
+</script>
+
+<style scoped>
+.missions {
+  grid-template-rows: minmax(0, 1fr) auto auto;
+}
+</style>
diff --git a/store/index.js b/store/index.js
index bf07b8d..5cdf9a5 100644
--- a/store/index.js
+++ b/store/index.js
@@ -65,6 +65,7 @@ export const state = () => ({
       instrument: 'Mechanical Clock',
       worker: 'Engineer',
 
+      unlocked: true,
       cost: 10,
       created: false,
 
@@ -73,7 +74,7 @@ export const state = () => ({
       baseReward: 5, // currency added when the bar is completed
 
       workerLevel: 0, // 0 = not hired; 1+ = hired
-      nextWorkerCost: 25, // currency cost of next worker
+      nextWorkerCost: 50, // currency cost of next worker
       nextWorkerFactor: 1.5, // worker cost *= this factor after each purchase
 
       unlockThreshold: { tech: null, currency: 0 },
@@ -82,6 +83,8 @@ export const state = () => ({
       instrument: 'Hourglass',
       worker: 'Glassblower',
 
+      unlocked: false,
+      minDateUnlocked: 1100 * 12,
       cost: 100,
       created: false,
 
@@ -90,7 +93,7 @@ export const state = () => ({
       baseReward: 35,
 
       workerLevel: 0,
-      nextWorkerCost: 200,
+      nextWorkerCost: 250,
       nextWorkerFactor: 1.6,
 
       unlockThreshold: { tech: null, currency: 10000 },
@@ -99,6 +102,8 @@ export const state = () => ({
       instrument: 'Pocket Watch',
       worker: 'Miniaturist',
 
+      unlocked: false,
+      minDateUnlocked: 1600 * 12,
       cost: 1000,
       created: false,
 
@@ -107,7 +112,7 @@ export const state = () => ({
       baseReward: 80,
 
       workerLevel: 0,
-      nextWorkerCost: 2000,
+      nextWorkerCost: 500,
       nextWorkerFactor: 1.8,
 
       unlockThreshold: { tech: 0, currency: new Decimal(10e5) },
@@ -124,12 +129,50 @@ export const state = () => ({
 
   missions: [
     {
-      name: 'Create the Time Machine',
-      description: 'Soon you will be able to control time itself.',
-      completionCriteria: {
-        cost: 6000,
+      name: 'Train an Apprentice',
+      description:
+        'One man can only spend so much time staring at clocks each day. Hiring a second may make this easier.',
+      unlockCriteria: {
+        unit: 'instruments',
+        value: 1,
       },
-      available: true,
+      completionCriteria: {
+        unit: 'apprenticeLevels',
+        value: 5,
+      },
+      unlocked: true,
+      viewed: false,
+      complete: false,
+    },
+    {
+      name: 'Study Time Magic',
+      description:
+        "As time ticks away you begin to ponder the mysteries of time's origins and possibilities.",
+      unlockCriteria: {
+        unit: 'apprenticeLevels',
+        value: 1,
+      },
+      completionCriteria: {
+        unit: 'spareTime',
+        value: 250,
+      },
+      unlocked: true,
+      viewed: false,
+      complete: false,
+    },
+    {
+      name: 'Create the Time Machine',
+      description:
+        'Your magnum opus. Soon you will be able to control time itself.',
+      unlockCriteria: {
+        unit: 'missionsCompleted',
+        value: ['Train an Apprentice', 'Study Time Magic'],
+      },
+      completionCriteria: {
+        unit: 'spareTime',
+        value: 1000,
+      },
+      unlocked: false,
       viewed: false,
       complete: false,
     },
@@ -139,24 +182,27 @@ export const state = () => ({
         'Your body seems to be failing you. ' +
         'Write a book to pass your knowedge to your younger self through the time machine. ' +
         "Now where's your pen...",
-      appearanceCriteria: {
-        age: 100,
+      unlockCriteria: {
+        unit: 'timeJumpsBackwards',
+        value: 1,
       },
       completionCriteria: {
-        maxAge: true,
+        unit: 'maxAge',
       },
-      available: true,
+      unlocked: false,
       viewed: false,
       complete: false,
     },
   ],
-  gameDate: 1991 * 12,
-  playerAge: 34 * 12,
-  playerAgeMax: 80 * 12,
+
+  gameDate: 1400 * 12,
+  playerAge: 30 * 12,
+  playerAgeMax: 60 * 12,
   playerLivedTotal: 0,
   wisdomGained: 0, // wisdom gained so far on this run, not applied until player sends the book.
   wisdomApplied: 0, // wisdom from previous runs
   totalLifetimes: 1,
+  timeJumpsBackwards: 0,
 })
 
 export const getters = {
@@ -205,6 +251,22 @@ export const getters = {
 
     return `${year}y${month}m`
   },
+  missionIsCompleted: (state) => (missionName) => {
+    const mission = state.missions.find((m) => m.name === missionName)
+
+    return mission && mission.complete
+  },
+  apprenticeLevels: (state) =>
+    state.processes.reduce(
+      (totalLevels, process) => (totalLevels += process.workerLevel),
+      0
+    ),
+  instruments: (state) =>
+    state.processes.reduce(
+      (totalInstruments, process) =>
+        process.created ? totalInstruments + 1 : totalInstruments,
+      0
+    ),
 }
 
 export const mutations = {
@@ -229,10 +291,14 @@ export const mutations = {
   setMissionViewed: (state, missionIndex) => {
     Vue.set(state.missions[missionIndex], 'viewed', true)
   },
-  completeMission: (state, mission) => {
-    const index = state.missions.findIndex((m) => m.name === mission.name)
+  completeMission: (state, missionName) => {
+    const index = state.missions.findIndex((m) => m.name === missionName)
     Vue.set(state.missions[index], 'complete', true)
   },
+  unlockMission: (state, missionName) => {
+    const index = state.missions.findIndex((m) => m.name === missionName)
+    Vue.set(state.missions[index], 'unlocked', true)
+  },
   levelUpApprentice: (state, process) => {
     if (process.nextWorkerCost > state.currency) {
       return