King Neptune's Adventure
Nintendo Entertainment System · 1990
About this game
King Neptune's kingdom has been disturbed and turned into an evil underwater world.
A dark tentacled creature has stolen his magical orb and eight other artifacts.
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Armed with bouncing lightshots and a limited amount of bubble bombs that can be detonated at your command, you need to guide Neptune through nine side-scrolling levels to recover the items.
Shoot specific types of enemies to gather health and bombs.
The treasure can be recovered by beating bosses or with the help of royal dolphins.
There is an adventure aspect as well, you need to collect keys to open specific doors and some items can only be accessed by solving another quest first.
The final confrontation will lead you to the master creature's lair in the inner sanctum of Atlantis.
About Nintendo Entertainment System
The Nintendo Entertainment System (1983 in Japan, 1985 in the West) revived the North American video game industry after the 1983 crash and established conventions — cartridges, licensing seals, save systems — that shaped the industry for decades. NES collecting is one of the most established retro markets: common titles remain cheap, but a well-known handful of low-print-run games (many from smaller third-party publishers) are among the most expensive video games in existence.
Gamevaro tracks King Neptune's Adventure for Nintendo Entertainment System with separate market values for loose, complete-in-box (CIB) and factory-sealed copies, sourced from real eBay sales. Prices also vary by region — PAL, NTSC-U and NTSC-J releases of the same game often sell for different amounts due to print run sizes and regional collector demand.
Adding King Neptune's Adventure to a Gamevaro collection takes seconds — search by title or scan the box barcode, and the app fills in cover art, release details and current pricing automatically. This NES release dates back to 1990.
Price history
Market values by condition
NTSC-U
Recent sales
| Date | Type | Region | Price |
|---|---|---|---|
| 2026-07-12 | Box Only | NTSC-U | €70.87 |
| 2026-07-12 | Graded New | NTSC-U | €1469.82 |
| 2026-07-12 | New (sealed) | NTSC-U | €997.38 |
| 2026-07-12 | Item only | NTSC-U | €94.02 |
| 2026-07-12 | Manual Only | NTSC-U | €62.55 |
| 2026-07-12 | Complete in Box | NTSC-U | €249.30 |
| 2026-07-10 | New (sealed) | NTSC-U | €996.94 |
| 2026-07-10 | Complete in Box | NTSC-U | €249.19 |
| 2026-07-10 | Box Only | NTSC-U | €70.84 |
| 2026-07-10 | Manual Only | NTSC-U | €62.53 |
| 2026-07-10 | Graded New | NTSC-U | €1469.17 |
| 2026-07-10 | Item only | NTSC-U | €93.97 |
| 2026-06-18 | Graded New | NTSC-U | €1449.03 |
| 2026-06-18 | Complete in Box | NTSC-U | €245.77 |
| 2026-06-18 | Item only | NTSC-U | €92.22 |
| 2026-06-18 | Box Only | NTSC-U | €69.86 |
| 2026-06-18 | New (sealed) | NTSC-U | €983.27 |
| 2026-06-18 | Manual Only | NTSC-U | €61.55 |
| 2026-06-17 | Complete in Box | NTSC-U | €245.77 |
| 2026-06-17 | Item only | NTSC-U | €92.22 |
| 2026-06-17 | Manual Only | NTSC-U | €61.55 |
| 2026-06-17 | Graded New | NTSC-U | €1449.03 |
| 2026-06-17 | New (sealed) | NTSC-U | €983.27 |
| 2026-06-17 | Box Only | NTSC-U | €69.86 |
| 2026-06-15 | Graded New | NTSC-U | €1452.41 |
| 2026-06-15 | Complete in Box | NTSC-U | €246.35 |
| 2026-06-15 | Box Only | NTSC-U | €70.03 |
| 2026-06-15 | Item only | NTSC-U | €93.36 |
| 2026-06-15 | New (sealed) | NTSC-U | €985.56 |
| 2026-06-15 | Manual Only | NTSC-U | €61.63 |
Market insights
Rarity & condition
King Neptune's Adventure has a steady sales history on the tracked marketplaces, meaning enough copies circulate to establish a reliable market price.
Complete-in-box (CIB) copies typically command a premium over loose cartridges/discs because the original box and manual are more fragile and get discarded or damaged over time — fewer complete sets survive.
Frequently asked questions
How much is King Neptune's Adventure worth?
King Neptune's Adventure for Nintendo Entertainment System is currently worth €168.41 loose, €249.30 complete in box, and €997.38 factory sealed. Prices are based on real sales and update regularly on Gamevaro.
Is King Neptune's Adventure rare?
King Neptune's Adventure has a steady sales history on the tracked marketplaces, meaning it trades hands regularly and isn't considered particularly rare.
What's the difference between loose, CIB and sealed for King Neptune's Adventure?
Loose means cartridge or disc only, CIB (complete in box) includes the original box and manual, and sealed means factory-sealed and never opened. For King Neptune's Adventure, loose is €168.41 and CIB is €249.30 — CIB commands a premium because original boxes and manuals are fragile and often don't survive.
Ratings & Reviews
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