How to Complete the 'Shimanoyama Region' Treasure Hunt in Forza Horizon 6 (Series 4 Guide)

Summary: The 'Shimanoyama Region' Treasure Hunt is officially live in Forza Horizon 6 Series 4, tasking players with deciphering a cryptic riddle to track down a hidden chest for massive seasonal points. As part of the ongoing Horizon Mascot Party updates, completing this specific weekly challenge is mandatory if you want to unlock the exclusive 20-point and 40-point reward cars.

Because the in-game map only provides a massive red circle with zero map pins, thousands of drivers are turning to Google to find the exact chest spot. Below is the fully expanded riddle solution, step-by-step driving directions, vehicle tuning recommendations, glitch fixes, and map coordinate vectors to help you smash the chest instantly.

Step 1: The Shimanoyama Riddle & Clue Solution

To make the physical treasure chest spawn on your map server, you must first complete a specific trigger action tied to the weekly clue. If you drive straight to the chest location without doing this step, the garage bay will remain empty.

The Clue Text: "Slide through the mountain peaks where the tire smoke rises, a perfect score unlocks the hidden prize."

The Solution: You must achieve a 3-Star Rating on any single Drift Zone located within the boundaries of the Shimanoyama mountainous district.

Recommended Car Setup & Tuning Share Codes

Do not use standard road racing builds. The tight switchbacks of Shimanoyama require high angle and quick transition controls.

Top Vehicle Choice: Formula Drift #151 Toyota GR Supra (S1 Class).

Budget Alternative: Nissan Silvia Spec-R (S15). Upgrade it with a 6.2L V8 engine swap, Drift Spring and Dampers, and a Drift Differential.

Driving Strategy: Equip specialized drift tires. Force your transmission into manual mode and lock your gears into 3rd gear. This maintains high RPM and wide angle multipliers around the tight Shimanoyama hairpin turns.

Vehicle Selection: If you are still building your garage for this challenge, browsing Forza Horizon 6 Cars can help you compare additional vehicle options for drift builds, seasonal events, and other Series 4 challenges.

The Trigger: Once the 3-star notification pops up on your UI, the game will play an aerial cutscene, and a gold circle will update on your world map world space.

Step 2: Exact Shimanoyama Treasure Chest Location

The treasure chest is well hidden away from the main asphalt highway paths to intentionally trick players exploring the open world. Use these exact routing instructions to locate the asset:

Shimanoyama Drift Circuit⟶North Entrance Garages⟶Third Bay from Left⟶Smash Box 3

Fast Travel: Open your world map and warp directly to the Shimanoyama Drift Circuit hub outpost entrance.

Locate the Maintenance Garages: From the spawn point, turn your camera directly north behind the starting grid flags. Look past the main spectator grandstands to find a long row of gray concrete vehicle service bays.

The Hidden Bay: Drive up to the row of industrial structures. The third garage door counting from the left side is propped partially open.

Smash and Claim: Drive your car front-first inside the dark bay. The pink and gold Horizon Festival Treasure Chest is sitting right next to a yellow hydraulic engine hoist. Ram it at any speed to crack it open.

The Rewards: Unlocking this chest immediately grants your profile account 100,000 Credits, 5,000 XP, and 3 Series Points toward your seasonal progress milestones.

Troubleshooting Bugged Spawns: The "Empty Garage" Fix

A known server synchronization issue in the launch build of Series 4 causes the treasure chest to remain invisible for certain players even after completing the 3-star drift requirement. If you encounter an empty garage bay, execute this quick fix sequence:

Open the pause menu and navigate to the Online tab.

Select the Horizon Solo option to disconnect from the live Horizon Life multiplayer matchmaking servers.

This forces the game engine to re-render all local physics objects and seasonal assets natively on your local hard drive.

The chest will instantly appear inside the third garage door bay. Drive into it, claim the rewards, and toggle Horizon Life back on to rejoin your friends.

Bonus: Nearby Series 4 Photo Challenge Location

While you are exploring the northern sectors of the map for the treasure hunt, you can knock out the weekly Hokuryu Sunflower Farm Photo Challenge in under two minutes to maximize your efficiency:

Where to find it: Travel to the far eastern edge of the Hokubu Region. The farm fields are located directly west of the massive coastal Irabuohashi Bridge landmark structure.

The Objective: Purchase or gift any Japanese Domestic Market (JDM) classified vehicle (such as a Honda Civic Type R or Mazda RX-7). Drive into the dead center of the bright yellow flower fields and open your D-Pad photo mode.

The Reward: Snap a quick picture featuring both your car and the flowers to instantly unlock the rare "Yellow Sports Sunglasses" vanity cosmetic item for your avatar character profile.

Remaining Series 4 Playlist Completion Milestones

To unlock the high-tier prize cars before this seasonal week expires, combine the points from this treasure hunt with the following playlist challenges:

20 Series Points Reward: Exomotive Exocet Off-Road (Exclusive Season Reward Car).

40 Series Points Reward: Datsun 2000 Roadster (Hard-to-Find Legendary Return).

Weekly Trial Challenge: Complete the "Mascot Madness" championship co-op race using an A-Class retro sports build to secure an additional 10 playlist points instantly.