diff --git a/app/Models/SeasonRoom.php b/app/Models/SeasonRoom.php
index 86397032a1d..a5bbfc281c3 100644
--- a/app/Models/SeasonRoom.php
+++ b/app/Models/SeasonRoom.php
@@ -7,6 +7,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 
 /**
@@ -16,5 +17,7 @@
  */
 class SeasonRoom extends Model
 {
+    use HasFactory;
+
     public $timestamps = false;
 }
diff --git a/app/Models/SeasonScoreFactor.php b/app/Models/SeasonScoreFactor.php
index 0e658b5aed3..aff70c8fa59 100644
--- a/app/Models/SeasonScoreFactor.php
+++ b/app/Models/SeasonScoreFactor.php
@@ -5,6 +5,8 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
 /**
  * @property int $id
  * @property float $factor
@@ -12,5 +14,7 @@
  */
 class SeasonScoreFactor extends Model
 {
+    use HasFactory;
+
     public $timestamps = false;
 }
diff --git a/database/factories/SeasonRoomFactory.php b/database/factories/SeasonRoomFactory.php
new file mode 100644
index 00000000000..3492702f4f3
--- /dev/null
+++ b/database/factories/SeasonRoomFactory.php
@@ -0,0 +1,21 @@
+<?php
+
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the GNU Affero General Public License v3.0.
+// See the LICENCE file in the repository root for full licence text.
+
+declare(strict_types=1);
+
+namespace Database\Factories;
+
+use App\Models\SeasonRoom;
+
+class SeasonRoomFactory extends Factory
+{
+    protected $model = SeasonRoom::class;
+
+    public function definition(): array
+    {
+        // pivot table...
+        return [];
+    }
+}
diff --git a/database/factories/SeasonScoreFactorFactory.php b/database/factories/SeasonScoreFactorFactory.php
new file mode 100644
index 00000000000..1df687bdf53
--- /dev/null
+++ b/database/factories/SeasonScoreFactorFactory.php
@@ -0,0 +1,22 @@
+<?php
+
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the GNU Affero General Public License v3.0.
+// See the LICENCE file in the repository root for full licence text.
+
+declare(strict_types=1);
+
+namespace Database\Factories;
+
+use App\Models\SeasonScoreFactor;
+
+class SeasonScoreFactorFactory extends Factory
+{
+    protected $model = SeasonScoreFactor::class;
+
+    public function definition(): array
+    {
+        return [
+            'factor' => 1,
+        ];
+    }
+}
diff --git a/tests/Models/UserSeasonScoreTest.php b/tests/Models/UserSeasonScoreTest.php
new file mode 100644
index 00000000000..11e5f9d9eab
--- /dev/null
+++ b/tests/Models/UserSeasonScoreTest.php
@@ -0,0 +1,202 @@
+<?php
+
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the GNU Affero General Public License v3.0.
+// See the LICENCE file in the repository root for full licence text.
+
+declare(strict_types=1);
+
+namespace Tests\Models;
+
+use App\Models\Multiplayer\PlaylistItem;
+use App\Models\Multiplayer\Room;
+use App\Models\Season;
+use App\Models\SeasonRoom;
+use App\Models\SeasonScoreFactor;
+use App\Models\User;
+use App\Models\UserSeasonScore;
+use Tests\TestCase;
+
+class UserSeasonScoreTest extends TestCase
+{
+    private Season $season;
+    private User $user;
+
+    public function testAddMultipleScores(): void
+    {
+        foreach ([1, 0.75, 0.5] as $factor) {
+            SeasonScoreFactor::factory()->create([
+                'factor' => $factor,
+                'season_id' => $this->season,
+            ]);
+        }
+
+        $this->createRoomWithPlay(10);
+
+        $userScore = UserSeasonScore::where('user_id', $this->user->getKey())
+            ->where('season_id', $this->season->getKey())
+            ->first();
+
+        $this->assertSame($userScore->total_score, (float) 10); // 10*1
+
+        $this->createRoomWithPlay(15);
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, 22.5); // 15*1 + 10*0.75
+
+        $this->createRoomWithPlay(25);
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, 41.25); // 25*1 + 15*0.75 + 10*0.5
+    }
+
+    public function testAddMultipleScoresWithChildrenRooms(): void
+    {
+        foreach ([1, 0.75, 0.5] as $factor) {
+            SeasonScoreFactor::factory()->create([
+                'factor' => $factor,
+                'season_id' => $this->season,
+            ]);
+        }
+
+        $firstRoom = $this->createRoomWithPlay(10);
+
+        $userScore = UserSeasonScore::where('user_id', $this->user->getKey())
+            ->where('season_id', $this->season->getKey())
+            ->first();
+
+        $this->assertSame($userScore->total_score, (float) 10); // 10*1
+
+        $this->createRoomWithPlay(15, $firstRoom->getKey());
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, (float) 15); // 15*1
+
+        $secondRoom = $this->createRoomWithPlay(20);
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, 31.25); // 20*1 + 15*0.75
+
+        $this->createRoomWithPlay(20, $secondRoom->getKey());
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, 31.25); // 20*1 + 15*0.75
+
+        $thirdRoom = $this->createRoomWithPlay(10);
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, 36.25); // 20*1 + 15*0.75 + 10*0.5
+
+        $this->createRoomWithPlay(30, $thirdRoom->getKey());
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, 52.5); // 30*1 + 20*0.75 + 15*0.5
+    }
+
+    public function testAddHigherScoreInChildRoom(): void
+    {
+        SeasonScoreFactor::factory()->create(['season_id' => $this->season]);
+
+        $room = $this->createRoomWithPlay(10);
+
+        $userScore = UserSeasonScore::where('user_id', $this->user->getKey())
+            ->where('season_id', $this->season->getKey())
+            ->first();
+
+        $this->assertSame($userScore->total_score, (float) 10);
+
+        $this->createRoomWithPlay(15, $room->getKey());
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, (float) 15);
+    }
+
+    public function testAddHigherScoreInParentRoom(): void
+    {
+        SeasonScoreFactor::factory()->create(['season_id' => $this->season]);
+
+        $room = $this->createRoomWithPlay(15);
+
+        $userScore = UserSeasonScore::where('user_id', $this->user->getKey())
+            ->where('season_id', $this->season->getKey())
+            ->first();
+
+        $this->assertSame($userScore->total_score, (float) 15);
+
+        $this->createRoomWithPlay(10, $room->getKey());
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, (float) 15);
+    }
+
+    public function testAddSameScoreInChildAndParentRoom(): void
+    {
+        SeasonScoreFactor::factory()->create(['season_id' => $this->season]);
+
+        $room = $this->createRoomWithPlay(10);
+
+        $userScore = UserSeasonScore::where('user_id', $this->user->getKey())
+            ->where('season_id', $this->season->getKey())
+            ->first();
+
+        $this->assertSame($userScore->total_score, (float) 10);
+
+        $this->createRoomWithPlay(10, $room->getKey());
+
+        $userScore->refresh();
+        $this->assertSame($userScore->total_score, (float) 10);
+    }
+
+    public function testAddScoreInChildRoomOnly(): void
+    {
+        SeasonScoreFactor::factory()->create(['season_id' => $this->season]);
+
+        $room = $this->createRoom();
+        $this->createRoomWithPlay(10, $room->getKey());
+
+        $userScore = UserSeasonScore::where('user_id', $this->user->getKey())
+            ->where('season_id', $this->season->getKey())
+            ->first();
+
+        $this->assertSame($userScore->total_score, (float) 10);
+    }
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->season = Season::factory()->create();
+        $this->user = User::factory()->create();
+    }
+
+    private function createRoom(?int $parentId = null): Room
+    {
+        $room = Room::factory()->create([
+            'category' => 'spotlight',
+            'parent_id' => $parentId,
+        ]);
+
+        SeasonRoom::factory()->create([
+            'room_id' => $room,
+            'season_id' => $this->season,
+        ]);
+
+        return $room;
+    }
+
+    private function createRoomWithPlay(float $totalScore, ?int $parentId = null): Room
+    {
+        $room = $this->createRoom($parentId);
+
+        $playlistItem = PlaylistItem::factory()->create([
+            'owner_id' => $room->host,
+            'room_id' => $room,
+        ]);
+
+        $this->roomAddPlay($this->user, $playlistItem, [
+            'passed' => true,
+            'total_score' => $totalScore,
+        ]);
+
+        return $room;
+    }
+}