diff --git a/package.json b/package.json
index 0890c65..e747158 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,8 @@
     "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --fix --ignore-path .gitignore"
   },
   "dependencies": {
+    "date-fns": "^2.28.0",
+    "date-fns-tz": "^1.2.2",
     "vue": "^3.2.31",
     "vue-i18n": "^9.1.9",
     "vue-router": "^4.0.12"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7e7f6cf..4076265 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -12,6 +12,8 @@ specifiers:
   '@vue/eslint-config-typescript': ^10.0.0
   '@vue/test-utils': ^2.0.0-rc.18
   autoprefixer: 10.0.2
+  date-fns: ^2.28.0
+  date-fns-tz: ^1.2.2
   eslint: ^7.32.0
   eslint-config-standard: ^16.0.3
   eslint-plugin-import: 2.22.1
@@ -35,6 +37,8 @@ specifiers:
   vue-tsc: ^0.29.8
 
 dependencies:
+  date-fns: 2.28.0
+  date-fns-tz: 1.2.2_date-fns@2.28.0
   vue: 3.2.31
   vue-i18n: 9.1.9_vue@3.2.31
   vue-router: 4.0.12_vue@3.2.31
@@ -1255,6 +1259,19 @@ packages:
       whatwg-url: 10.0.0
     dev: true
 
+  /date-fns-tz/1.2.2_date-fns@2.28.0:
+    resolution: {integrity: sha512-vWtn44eEqnLbkACb7T5G5gPgKR4nY8NkNMOCyoY49NsRGHrcDmY2aysCyzDeA+u+vcDBn/w6nQqEDyouRs4m8w==}
+    peerDependencies:
+      date-fns: '>=2.0.0'
+    dependencies:
+      date-fns: 2.28.0
+    dev: false
+
+  /date-fns/2.28.0:
+    resolution: {integrity: sha512-8d35hViGYx/QH0icHYCeLmsLmMUheMmTyV9Fcm6gvNwdw31yXXH+O85sOBJ+OLnLQMKZowvpKb6FgMIQjcpvQw==}
+    engines: {node: '>=0.11'}
+    dev: false
+
   /debug/2.6.9:
     resolution: {integrity: sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==}
     dependencies:
diff --git a/src/components/AppHeader.vue b/src/components/AppHeader.vue
index b7a696d..3dde71f 100644
--- a/src/components/AppHeader.vue
+++ b/src/components/AppHeader.vue
@@ -3,13 +3,13 @@
     <RouterLink
       :class="{ 'opacity-0': isHome }"
       to="/"
-      class="text-xl text-stone-400 transition-opacity">
+      class="text-xl text-stone-400 hover:text-cyan-500 transition-opacity duration-200">
       <IconHouse />
     </RouterLink>
     <h1 class="py-2 text-3xl text-center">
       Numbers
     </h1>
-    <IconMenu class="text-xl" />
+    <IconMenu class="text-xl text-stone-400 hover:text-cyan-500 transition-opacity" />
   </div>
 </template>
 
diff --git a/src/composables/game-state.ts b/src/composables/game-state.ts
index 4a1ce82..1d3a4c5 100644
--- a/src/composables/game-state.ts
+++ b/src/composables/game-state.ts
@@ -1,8 +1,11 @@
+import { differenceInDays } from 'date-fns'
+import { utcToZonedTime } from 'date-fns-tz'
 import { computed, reactive, ref } from 'vue'
 
-import { getEmptyOperation, isOperationReady } from '../algo'
-import { GameState } from '../globals'
-import { Operation, Plaquette } from '../types'
+import { getEmptyOperation, isOperationReady } from '@/algo'
+import { BXL_TZ, GAME_STARTING_DATE, GameState } from '@/globals'
+import { Operation, Plaquette } from '@/types'
+import { getCurrentDate } from '@/utils'
 
 export const gameState = ref(GameState.Undefined)
 
@@ -25,3 +28,11 @@ export const isEndGame = computed(
 export const isResultPerfect = computed(
   () => !!operations.some(o => o.result?.value === result.value),
 )
+
+export function numberOfGamesSinceStart(): number {
+  const startDate = utcToZonedTime(
+    new Date(GAME_STARTING_DATE as string),
+    BXL_TZ,
+  )
+  return differenceInDays(startDate, getCurrentDate())
+}
diff --git a/src/globals.ts b/src/globals.ts
index ab4157d..c01e8c3 100644
--- a/src/globals.ts
+++ b/src/globals.ts
@@ -1,3 +1,6 @@
+export const GAME_STARTING_DATE = '2022-02-18'
+export const BXL_TZ = 'Europe/Brussels'
+
 export const operators = ['+', '-', '*', '/'] as const
 
 export const pools = {
diff --git a/src/utils.ts b/src/utils.ts
index 3d20c8d..d3f5c7b 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,17 +1,37 @@
+import { utcToZonedTime } from 'date-fns-tz'
+
+import { BXL_TZ, GAME_STARTING_DATE } from '@/globals'
+
+export function getCurrentDate(): Date {
+  return utcToZonedTime(new Date(), BXL_TZ)
+}
+
+// #region RNG
+
+export let random = Math.random
+
 /**
  *
  * @param min inclusive
  * @param max exclusive
  * @returns
  */
-export function randRange(min: number, max: number, rnd = Math.random): number {
+export function randRange(min: number, max: number, rnd = random): number {
   return Math.floor(rnd() * (max - min) + min)
 }
 
-export function randItem<T>(items: T[], rnd = Math.random): T {
+export function randItem<T>(items: T[], rnd = random): T {
   return items[Math.floor(rnd() * items.length)]
 }
 
+export function setMathPRNG(): void {
+  random = Math.random
+}
+
+export function setDailyPRNG(): void {
+  random = initDailyPRNG()
+}
+
 /**
  * Shuffles an array in place and returns it
  * @param array
@@ -19,12 +39,12 @@ export function randItem<T>(items: T[], rnd = Math.random): T {
  */
 export function shuffle<T>(array: T[]): T[] {
   let currentIndex = array.length
-  let randomIndex
+  let randomIndex: number
 
   // While there remain elements to shuffle...
   while (currentIndex !== 0) {
     // Pick a remaining element...
-    randomIndex = Math.floor(Math.random() * currentIndex)
+    randomIndex = Math.floor(random() * currentIndex)
     currentIndex--
 
     // And swap it with the current element.
@@ -36,3 +56,38 @@ export function shuffle<T>(array: T[]): T[] {
 
   return array
 }
+
+function initDailyPRNG(): () => number {
+  // Prefix the seed when in dev to avoid spoiling myself while working on it
+  const prefix = import.meta.env.DEV ? 'dev-' : ''
+  const hashed = hashStr(prefix + GAME_STARTING_DATE)
+  return mulberry32(hashed)
+}
+
+function mulberry32(a: number) {
+  return function () {
+    let t = (a += 0x6d2b79f5)
+    t = Math.imul(t ^ (t >>> 15), t | 1)
+    t ^= t + Math.imul(t ^ (t >>> 7), t | 61)
+    return ((t ^ (t >>> 14)) >>> 0) / 4294967296
+  }
+}
+
+/**
+ * https://stackoverflow.com/a/7616484
+ * @param val
+ * @returns
+ */
+function hashStr(val: string): number {
+  let hash = 0
+  if (val.length === 0) {
+    return 0
+  }
+  for (let i = 0; i < val.length; ++i) {
+    hash = (hash << 5) - hash + val[i].charCodeAt(0)
+    hash |= 0
+  }
+  return hash
+}
+
+// #endregion RNG
diff --git a/src/views/GameView.vue b/src/views/GameView.vue
index 6fd1d25..c568231 100644
--- a/src/views/GameView.vue
+++ b/src/views/GameView.vue
@@ -10,7 +10,7 @@
     <Transition name="zero_height">
       <div
         class="text-center"
-        v-if="gameState === GameState.Waiting">
+        v-if="gameState <= GameState.Waiting">
         <div v-if="isDaily">
           Le défi quotidien vous propose un résultat différent chaque jour,
           commun à tous les joueurs.<br>
@@ -89,7 +89,7 @@ import {
 } from '@/composables/game-state'
 import { GameState, pools } from '@/globals'
 import { OperatorType, Plaquette } from '@/types'
-import { randItem, randRange } from '@/utils'
+import { randItem, random, randRange, setDailyPRNG, setMathPRNG } from '@/utils'
 
 const { t } = useI18n() // call `useI18n`, and spread `t` from  `useI18n` returning
 
@@ -99,7 +99,7 @@ const { t } = useI18n() // call `useI18n`, and spread `t` from  `useI18n` return
 
 const difficultyLevel = ref<1 | 2>(1)
 
-const isDaily = computed(() => useRoute().name === 'daily')
+const isDaily = computed(() => useRoute()?.name === 'daily')
 const shownPlaquettes = computed(() =>
   gameIsRunning.value ? plaquettes.value : [],
 )
@@ -157,6 +157,10 @@ function selectOperator(o: OperatorType): void {
 
 function reboot(): void {
   gameState.value = GameState.Playing
+
+  // The daily number is >= 500 to have a minimum challenge
+  const minValue = isDaily.value ? 500 : 101
+
   do {
     // Find a problem
     // result.value = randRange(101, 1000)
@@ -164,9 +168,9 @@ function reboot(): void {
     result.value = (() => {
       switch (difficultyLevel.value) {
         case 1:
-          return randRange(101, 1000)
+          return randRange(minValue, 1000)
         case 2:
-          return randRange(101, 1000)
+          return randRange(minValue, 1000)
       }
     })()
     // result.value = 29
@@ -178,8 +182,8 @@ function reboot(): void {
     plaquettes.value = []
     const poolCopy = [...pools[difficultyLevel.value]]
     for (let i = 0; i < 6; ++i) {
-      const random = Math.floor(Math.random() * poolCopy.length)
-      const el = poolCopy.splice(random, 1)[0]
+      const rndItem = Math.floor(random() * poolCopy.length)
+      const el = poolCopy.splice(rndItem, 1)[0]
       plaquettes.value.push({ value: el, free: true })
     }
     // plaquettes.value = [4, 8, 10, 25, 50, 100].map(value => ({
@@ -201,9 +205,18 @@ function reboot(): void {
  */
 
 onMounted(() => {
-  // reboot()
-  // gameState.value = GameState.Waiting
+  if (isDaily.value) {
+    console.log('daily rng')
+    setDailyPRNG()
+  }
+  else {
+    console.log('normal rng')
+    setMathPRNG()
+  }
+
   result.value = 0
+
+  // Wait until after the page transion to generate the number
   setTimeout(() => {
     reboot()
     gameState.value = GameState.Waiting