The Tidal Coast (N5) opens with N4 after you play the Blue Music Box. Use the finder below for every Gray, Red, Green, and Blue chest and all eight Musical Coins—with exact room-map links for Day/Night and each map variant. First priority is the Gray Chest Yellow Book, which pairs with N4’s Trident to open The Steep Canyon.
FIRST CLEAR PRIORITY
Open the Gray Chest for the Yellow Book, then pair it with the Trident
Carry the Gray Key to the Gray Chest and take the Yellow Book. Combined with the Trident from N4 Bank of the Wild River, it calls lightning over the canyon and opens S4 The Steep Canyon from The Big Bridge. Come back later for Foot of Stone, Electric Fan Propeller, Green Gem, and Musical Coins.
N5 CHECKLIST · THE TIDAL COAST
Tidal Coast Finder
0 / 12 targets marked · browser checklist only
Map links open the Room & Target Index for this level. Match Day/Night and variant to your overworld state. Later variants can move some routes, but chest colors and treasure rewards stay the same. Progress is stored only in this browser.
ALL FOUR CHESTS · N5
The Tidal Coast treasures by chest color
Each chest needs its matching key color in the same level. Colors are not unlocked globally—if you drop a key, go back and pick it up again. Room numbers below match the default Day layout; open the map link for live markers on your current Day/Night and variant.
| Chest | Treasure | Key rooms | Chest room | What it does | Map |
|---|---|---|---|---|---|
| Gray / Grey | Yellow Book |
0, 7, 9, 20, 27 | 0, 7, 9, 20, 27 | With the Trident (N4 Gray), calls lightning and opens S4 The Steep Canyon. | Open Gray Chest map |
| Red |  Foot of Stone |
10, 13 | 29 | Unlocks Stagnant Swamp V2, Steep Canyon V2, and Volcano’s Base V4. | Open Red Chest map |
| Green |  Electric Fan Propeller |
4 | 21, 23 | Unlocks A Town in Chaos V4 for late West revisit routes. | Open Green Chest map |
| Blue |  Green Gem |
12, 28 | 17 | Collectible for the full 100-treasure Perfect screen. No major road unlock. | Open Blue Chest map |
MUSICAL COINS · MUSIC COINS
All 8 Musical Coins in The Tidal Coast
Every level has eight Musical Coins. They are not required for the Perfect treasure screen, but finishing all 200 coins across the game unlocks Golf Building Course 4. Room numbers below match the default Day layout.
| Coin | Primary rooms | Also present in |
|---|---|---|
| Musical Coin 1 | 0 | 7, 9, 20, 27 |
| Musical Coin 2 | 0 | 7, 9, 20, 27 |
| Musical Coin 3 | 0 | 7, 9, 20, 27 |
| Musical Coin 4 | 0 | 7, 9, 20, 27 |
| Musical Coin 5 | 10 | 13 |
| Musical Coin 6 | 12 | 28 |
| Musical Coin 7 | 12 | 28 |
| Musical Coin 8 | 29 | — |
Open all Musical Coin markers on the Room & Target Index → · Full Musical Coins Finder for every level →
NORTH COAST ROUTE
How The Tidal Coast fits the mid-game path
Unlock N5
Collect the Blue Music Box in W4 A Town in Chaos, play it on the overworld, then enter The Tidal Coast from the North coast path (same unlock as N4).
Yellow Book + Trident
Grab N5 Yellow Book and N4 Trident (order flexible). Together they call lightning and open S4 The Steep Canyon from The Big Bridge.
Later north push
Garlic (S3 Red Chest) clears the path from The Tidal Coast to N6 Sea Turtle Rocks and powers Wario’s dash for more coastal routes.
MAP VARIANTS · DAY & NIGHT
When The Tidal Coast layout changes
N5 has four progression variants on both Day and Night. Variant 1 is available once the Blue Music Box opens the level. Later variants open after you collect specific treasures elsewhere:
| Variant | Requirements | Notes | Map |
|---|---|---|---|
| V1 | None (level open via Blue Music Box) | Default first visit. Grab the Yellow Book here. | Open Day map |
| V2 | Grab Glove (S4 Gray Chest) | Grab ability opens extra coastal routes and object moves. | Open Day map |
| V3 | Statue (N4 Green Chest) | Statue-linked layout for deeper N5 revisits. | Open Day map |
| V4 | Sapling of Growth (W4 Blue Chest) | Late-game layout for remaining N5 routes and clean-up. | Open Day map |
FIRST VISIT ROUTE
What to do in The Tidal Coast on the first clear
Enter from the North coast
After the Blue Music Box event, walk the North shore into N5. You can do N4 and N5 in either order once both are open.
Gray Key → Yellow Book
Hunt the Gray Key in the coastal room family (rooms 0, 7, 9, 20, 27), open the Gray Chest, leave with the Yellow Book, and pair it with the Trident for Steep Canyon.
Revisit N5 later
Come back for Foot of Stone, Electric Fan Propeller, Green Gem, and Musical Coins when Grab Glove, Statue, or Sapling of Growth unlock remaining rooms.
FAQ
The Tidal Coast FAQ
How do you unlock The Tidal Coast?
Play the Blue Music Box from W4 A Town in Chaos (Red Chest). That overworld event opens N4 Bank of the Wild River and N5 The Tidal Coast together on the North map.
How do I open the Gray / Grey Chest in The Tidal Coast?
Find the matching Gray Key in the coastal room set (rooms 0, 7, 9, 20, or 27 depending on map state), carry it to the Gray Chest in the same room family, and open it for the Yellow Book.
What does the Yellow Book do in Wario Land 3?
The Yellow Book pairs with the Trident from N4 Bank of the Wild River. Together they call lightning over the canyon and open S4 The Steep Canyon from The Big Bridge—an important mid-game South route.
What does the Foot of Stone do?
It unlocks Variant 2 of The Stagnant Swamp and The Steep Canyon, plus Variant 4 of The Volcano’s Base. It is a strong mid-game layout key rather than a brand-new overworld road.
What does the Electric Fan Propeller do?
It unlocks Variant 4 of A Town in Chaos for late West revisits. Grab it when you are cleaning up W4 or working remaining West treasures.
How many Musical Coins are in The Tidal Coast?
Eight—the same as every other level. Use the coin table above or the full Musical Coins Finder if you are missing one for 100% side goals.
Is The Tidal Coast required for the ending?
The Yellow Book is an important mid-game route item for Steep Canyon access with the Trident. The other N5 treasures support variants, Perfect completion, and 100% clean-up rather than the five Music Box temple ending set itself.
How do I reach Sea Turtle Rocks after The Tidal Coast?
Collect Garlic from the Red Chest in S3 Tower of Revival. Garlic powers Wario’s dash and opens the northern path from The Tidal Coast to N6 Sea Turtle Rocks.