diff --git a/src/components/qwixx/NumbersInput.svelte b/src/components/qwixx/NumbersInput.svelte
index 1b0d56f..16ab26f 100644
--- a/src/components/qwixx/NumbersInput.svelte
+++ b/src/components/qwixx/NumbersInput.svelte
@@ -1,20 +1,22 @@
 <script lang="ts">
-  import { createArray } from '../../utils/array';
-  import { t } from '../../utils/i18n';
-  import { Direction, type ColorConfig } from '../../lib/qwixx/types';
-  import { NUMBERS } from '../../lib/qwixx/constants';
-  import { isColorLocked } from '../../lib/qwixx/game';
-
-  import Lock from './Lock.svelte';
-  import LockOpen from './LockOpen.svelte';
+  import { createArray } from "../../utils/array";
+  import { t } from "../../utils/i18n";
+  import { Direction, type ColorConfig } from "../../lib/qwixx/types";
+  import { NUMBERS } from "../../lib/qwixx/constants";
+  import { isColorCompleted } from "../../lib/qwixx/game";
+  import Lock from "./Lock.svelte";
+  import LockOpen from "./LockOpen.svelte";
 
   interface Props {
     color: ColorConfig;
     numbers: number[];
+    isLocked: boolean;
     toggleNumber: (color: ColorConfig, number: number) => void;
+    toggleLocked: (color: ColorConfig) => void;
   }
 
-  const { color, numbers, toggleNumber }: Props = $props();
+  const { color, numbers, isLocked, toggleNumber, toggleLocked }: Props =
+    $props();
 
   const { key, direction, style } = color;
 
@@ -25,7 +27,7 @@
       case Direction.DESCENDING:
         return NUMBERS + 1 - index;
       default:
-        throw new Error('Unreachable code')
+        throw new Error("Unreachable code");
     }
   });
   const lastNumber = numberRange[numberRange.length - 1] as number;
@@ -34,7 +36,7 @@
   const max = $derived(Math.max(...numbers));
   const length = $derived(numbers.length);
 
-  const isLocked = isColorLocked(numbers, color);
+  const isCompleted = $derived(isColorCompleted(numbers, color));
 
   const isDisabled = $derived((number: number) => {
     switch (direction) {
@@ -48,7 +50,7 @@
   const onClick = $derived(
     (event: Event & { currentTarget: EventTarget & HTMLInputElement }) => {
       const { value, ariaDisabled } = event.currentTarget;
-      if (ariaDisabled === 'true') {
+      if (ariaDisabled === "true") {
         event.preventDefault();
         return;
       }
@@ -56,9 +58,43 @@
       toggleNumber(color, number);
     },
   );
+
+  let clickTimerId: ReturnType<typeof setTimeout> | null = null;
+
+  const onLockClick = $derived(
+    (event: Event & { currentTarget: EventTarget & HTMLInputElement }) => {
+      event.preventDefault();
+
+      if (!clickTimerId) {
+        // Single click
+        const { value, ariaDisabled } = event.currentTarget;
+        clickTimerId = setTimeout(() => {
+          clickTimerId = null;
+          if (ariaDisabled !== "true") {
+            const number = Number.parseInt(value, 10);
+            toggleNumber(color, number);
+          }
+        }, 300);
+      } else {
+        // FIXME: There's something wrong on mobile
+        // Double click
+        clearTimeout(clickTimerId);
+        clickTimerId = null;
+        if (!isCompleted) {
+          toggleLocked(color);
+        }
+      }
+    },
+  );
+
+  const checked = $derived(isCompleted || isLocked);
+
+  $effect(() => {
+    console.log(color.key, isCompleted, isLocked, checked);
+  });
 </script>
 
-<fieldset {style} class:locked={isLocked}>
+<fieldset {style} class:locked={isCompleted || isLocked}>
   <legend class="hide-visually">{t.qwixx.colors[key]}</legend>
   {#each numberRange as number}
     <input
@@ -66,7 +102,7 @@
       type="checkbox"
       name={key}
       checked={numbers.includes(number)}
-      aria-disabled={isDisabled(number)}
+      aria-disabled={isLocked || isDisabled(number)}
       value={number}
       onclick={onClick}
       class="hide-visually"
@@ -77,11 +113,12 @@
     id={`${key}-lock`}
     type="checkbox"
     name={key}
-    checked={numbers.includes(lastNumber)}
+    {checked}
     aria-disabled={isDisabled(lastNumber)}
     value={lastNumber}
-    onclick={onClick}
+    onclick={onLockClick}
     class="hide-visually lock"
+    class:locked={isLocked}
   />
   <label for={`${key}-lock`}>
     <Lock class="icon-lock" />
@@ -118,6 +155,7 @@
       background-color var(--transition-micro),
       opacity var(--transition-micro);
     cursor: pointer;
+    touch-action: manipulation;
   }
 
   @media (prefers-color-scheme: dark) {
@@ -126,7 +164,7 @@
     }
   }
 
-  input[aria-disabled='true'] + label {
+  input[aria-disabled="true"] + label {
     cursor: not-allowed;
   }
 
@@ -145,11 +183,11 @@
     opacity: 0.5;
   }
 
-  input[aria-disabled='true']:not(:checked) + label {
+  input[aria-disabled="true"]:not(:checked) + label {
     opacity: 0.5;
   }
 
-  input:nth-last-of-type(-n + 2)[aria-disabled='true'] + label {
+  input:nth-last-of-type(-n + 2)[aria-disabled="true"] + label {
     opacity: 0.5;
   }
 
@@ -157,6 +195,14 @@
     border-radius: 100%;
   }
 
+  input.lock.locked + label {
+    color: hsl(var(--hue) var(--saturation) calc(var(--lightness) - 15%));
+    background-color: hsl(
+      var(--hue) calc(var(--saturation) - 10%) calc(var(--lightness) + 15%) /
+        0.2
+    );
+  }
+
   input.lock:checked + label :global(.icon-lock-open) {
     display: none;
   }
diff --git a/src/components/qwixx/PlayerSheet.svelte b/src/components/qwixx/PlayerSheet.svelte
index 162c71f..5b61198 100644
--- a/src/components/qwixx/PlayerSheet.svelte
+++ b/src/components/qwixx/PlayerSheet.svelte
@@ -1,27 +1,28 @@
 <script lang="ts">
-  import { onMount } from 'svelte';
-  import { persisted } from 'svelte-persisted-store';
-
-  import type { ColorConfig, GameState } from '../../lib/qwixx/types.ts';
-  import { t } from '../../utils/i18n.ts';
-  import { stack, getPoints } from '../../lib/qwixx/game.ts';
-  import { COLORS } from '../../lib/qwixx/constants.ts';
-  import NumbersInput from './NumbersInput.svelte';
-  import PointsTable from './PointsTable.svelte';
-  import PenaltiesInput from './PenaltiesInput.svelte';
-  import ScoreEquation from './ScoreEquation.svelte';
-  import Undo from './Undo.svelte';
-  import Redo from './Redo.svelte';
+  import { onMount } from "svelte";
+  import { persisted } from "svelte-persisted-store";
+
+  import type { ColorConfig, GameState } from "../../lib/qwixx/types.ts";
+  import { t } from "../../utils/i18n.ts";
+  import { stack, getPoints } from "../../lib/qwixx/game.ts";
+  import { COLORS } from "../../lib/qwixx/constants.ts";
+  import NumbersInput from "./NumbersInput.svelte";
+  import PointsTable from "./PointsTable.svelte";
+  import PenaltiesInput from "./PenaltiesInput.svelte";
+  import ScoreEquation from "./ScoreEquation.svelte";
+  import Undo from "./Undo.svelte";
+  import Redo from "./Redo.svelte";
 
   const initialState: GameState = {
     red: [],
     yellow: [],
     green: [],
     blue: [],
+    locked: {},
     penalties: 0,
   };
 
-  const game = stack(persisted('qwixx-state', initialState));
+  const game = stack(persisted("qwixx-state", initialState));
   const { undo, redo, canUndo, canRedo } = game;
 
   function reset() {
@@ -54,24 +55,37 @@
     });
   }
 
+  function toggleLocked(color: ColorConfig) {
+    const { key } = color;
+    game.update((state) => {
+      return {
+        ...state,
+        locked: {
+          ...state.locked,
+          [key]: !state.locked[key],
+        },
+      };
+    });
+  }
+
   const points = getPoints(game);
 
   onMount(() => {
     const handleKeydown = (event: KeyboardEvent) => {
-      if (event.metaKey && event.key === 'z') {
+      if (event.metaKey && event.key === "z") {
         event.preventDefault();
         undo();
       }
-      if (event.metaKey && event.key === 'y') {
+      if (event.metaKey && event.key === "y") {
         event.preventDefault();
         redo();
       }
     };
 
-    document.addEventListener('keydown', handleKeydown);
+    document.addEventListener("keydown", handleKeydown);
 
     return () => {
-      document.removeEventListener('keydown', handleKeydown);
+      document.removeEventListener("keydown", handleKeydown);
     };
   });
 </script>
@@ -111,7 +125,13 @@
 
   <div class="numbers">
     {#each COLORS as color (color.key)}
-      <NumbersInput {color} numbers={$game[color.key]} {toggleNumber} />
+      <NumbersInput
+        {color}
+        numbers={$game[color.key]}
+        isLocked={Boolean($game.locked[color.key])}
+        {toggleNumber}
+        {toggleLocked}
+      />
     {/each}
   </div>
 </section>
diff --git a/src/lib/qwixx/game.ts b/src/lib/qwixx/game.ts
index 82c67ec..710770e 100644
--- a/src/lib/qwixx/game.ts
+++ b/src/lib/qwixx/game.ts
@@ -74,7 +74,7 @@ export function getPoints(state: Readable<GameState>) {
   });
 }
 
-export function isColorLocked(numbers: number[], color: ColorConfig) {
+export function isColorCompleted(numbers: number[], color: ColorConfig) {
   const { direction } = color;
   return (
     (direction === Direction.ASCENDING && numbers.includes(12)) ||
@@ -86,7 +86,7 @@ function getColorPoints(state: GameState, color: ColorConfig) {
   const numbers = state[color.key];
   let crosses = numbers.length;
 
-  if (isColorLocked(numbers, color)) {
+  if (isColorCompleted(numbers, color)) {
     crosses += 1;
   }
 
diff --git a/src/lib/qwixx/types.ts b/src/lib/qwixx/types.ts
index 3a00eb9..bf8008f 100644
--- a/src/lib/qwixx/types.ts
+++ b/src/lib/qwixx/types.ts
@@ -16,6 +16,7 @@ export type GameState = {
   yellow: number[];
   green: number[];
   blue: number[];
+  locked: { [key in Color]?: boolean };
   penalties: number;
 };