Boxguy Adventure 2 (SMS) Romhack

This is the sequel to Boxguy Adventure and also kinda somewhat a sequel of Boxguy’s Puresabe Adventure. All of the levels are finished. This also works with ValleyBell‘s Sonic SMS FM patch. If I update this it will be for bug fixes and level fixes.

V35 of Boxguy Adventure 2 works with Retro Achievements. https://retroachievements.org/game/37010/hashes

Story

After events of Boxguy Adventure and Boxguy’s Puresabe Adventure. Boxguy decides to take vacation on South Island and has a good time until Dr. Robotnik decides to take over the island and robotize all of it. Sonic not around because of the events of Sonic Forces. So Boxguy the Box goes to stop Robotnik. Boxguy’s Adventures continue in Boxguy Adventure 3: Super Boxguy World which has some unfinished patches you can play.

Also featured in F3 (You should vote for Boxguy https://strawpoll.com/PKgleJVW9Zp)

Updates Area

V2 – Fixed some collison issues with Act 1 GHZ and more finished Act 2 GHZ

V3 – Fixed collison issues with GHZ Act 2 and small improvements overall.

V4 – Fixed minor Collision issue with GHZ Act 1

V5 – Started work on BZ Act 1 and Boss acts are going unchanged from the OG Sonic 1 SMS.

V6 – a now mostly finished BZ Act 1.

V7 – BZ Act 1 finished!

V8 – Title Screen improvements (2 updates in one day!) + Collision Fixes

V9 – BZ Act 2 Mostly Finished and edited GHZ Act 3

V10 – Updated BZ Act 1 and BZ Act 2. Plus updated art.

V11 – Finished BZ Act 2

V12 – Started making Jungle Zone Act 1

V13 – Bug fixes and more improved Jungle Zone Act 1

V14 – Jungle Zone Act 1 finished! (mostly!)

V16 – Fully finished Jungle Zone Act 1

V17 GHZ and Bridge Zone have different names and new color palettes.

V18 – Small graphical changes and started working on Jungle Zone Act 2.

V19 – minor graphical changes

V20 – Started worked on Labyrinth Zone

V21 – Labyrinth Zone and Jungle Zone updates

V22 – Fixed some collison issues with Labyrinth Zone Act 1

V23 – Credits sprites update and LZ act 1 improvement

V24 – Added BG elements to Jungle Zone and edited LZ Act 2

V25 – Bug fixes

V26 – Labyrinth Zone Act 2 layout and SB Act 1 Layout changed

V27 – Minor layout changes

V28 – Started work Scrap Brain Zone Act 2

V29 – Some changes on Scrap Brain Act 2 & 1

V30 – Edited Special Stage 1, Edited Scrap Brain Zone Act 2 & 1 changed and Green Hill Zone Act 1 & 3 edited.

V31 & V32 – Edited start of Scrap Brain Zone 3, some edits done to Scrap Brain Zone Act 1 & 2 and fixed credits animation.

V33 – Sky Base Zone Act 1 and Scrap Brain Zone Act 3 have been edited.

V34 – Labyrinth Zone Act 1 & Sky Base Act 1 level design improvements

V35 – Sky Base Act 1 is fully finished!!!

V36 – Sky base Act 1, Jungle Zone Act 1, Bridge Zone Act 1 and Labyrinth Zone Act changes.

V37 – Some more animation has been adding the credits now it looks like Boxguy singing or is his talking. His eyes also change expressions in the credits to!

V38 – Improved some of Bridge Zone Act 1 & 2 level design. (too make it less annoying.)

V39 – As the update name says, I changed the title screen to make Boxguy’s hat look better and some shading changes.

V40 – Major color palette changes in all Zones plus the first map screen expect Labyrinth and Sky Base.

V41 – Fixed a weird ground bug in Labyrinth Zone Act 1 and 2.

V42 – I played through Labyrinth Zone Act 2 and finally fixed the ground bug issue, improved some of Scarp Brain’s level design (mostly Act 1) and some minor changes done to some of Boxguy’s sprites.

V43 – Moved 1-up in Sky Base Act 2 to be possible to get now and fixed leftover ground issues for Labyrinth Zone.

V44 – edited credits text to credit me and improved tiny bit of Boxguy’s credits sprites.

Hashes:

Filename: Sonic The Hedgehog (USA, Europe, Brazil) (En).sms
CRC-32: b519e833
SHA-1: 6b9677e4a9abb37765d6db4658f4324251807e07

Staff/Credits:

Everything by me (PoyoPoyo1985)
Special thanks to Adrian Gauna for showing where in the Acts the Labyrinth Zone floor bug was affecting the ground.

Relevant link: https://poyosoft.xyz/

YouTube Video:

File download:

Help about patching:

Most of the files you're about to download need to be applied to your game. Here is a list of utilities that allow you to do this:

Online Patcher: Marc Roblero's online patcher. Works with many different file types.
Floating IPS: NWell-known patcher for applying IPS and BPS files.
Delta Patcher: Used to apply xDelta files.
More Patchers

On most files, you can also press “Patch It”, to apply the patch without downloading the file.

Write a review

Reviews:

He’s Got Spunk And Knows How To Tread In Sonic’s Shoes

Written by: Adrian Gauna - March 24, 2026

Move over Sonic! Boxguy is in town.

Boxguy Adventure 2 on the Sega Master System is a delightful little platformer made from the heart of PoyoPoyo1985. The game is a Sonic The Hedgehog 8-bit ROM hack and a welcomed one at that.

Okay well the title character is unique and original and fits well in Sonic's shoes. Boxguy has all of Sonic's basic move sets, the jump, the roll and the speed and is very well animated not only in-game but on the title screen and in the ending credit sequence, a lot of care and attention has been put into the sprites and it shows.

Boxguy Adventure 2 also features different colour palettes for all of the zones, they've all had a make over and the art used in the ''Jungle'' zone looks especially beautiful. The Special Stages are still here as well as the Chaos Emeralds.

The level layouts and maps have been altered in every single act so forget about the paths you've always known from the original game because this has some serious alterations to get used to.

A break down of each zone:

Juice Hill Zone:

This is Boxguy's version of Green Hill, it has a sunset sky with lots of bottomless pits to jump over. There are plenty of rings to collect here making the journey exciting and the underground cavern has more waterways to walk through. It should be noted that the Game Gear's arrow signs have been ported over and used to good use here.

Night Time Zone:

This is Bridge Zone at night time with some new funky level layouts. The bridges you land on can get confusing at times as some crumble and some don't with no way to really know which one's are solid or not but the good news is that act 2 is no longer an auto-scroller so you can move at your own pace.

Jungle Zone:

Boxguy enters a raspberry filled jungle full of fruit in the background. Act 1 is quite challenging as the level is nearly twice as long as the original with plenty of platforming to do. Act 2 is no longer a ''no backtrack'' go zone meaning you can back track as much as you want and won't die from touching the bottom of the screen, just be careful as a fall from the very top can drop you all the way to the beginning.

Labyrinth Zone:

This is where the game really starts to test your skills and patience. The level and object placements here are fantastic! And act 1 has nearly 200 rings to collect if you look hard enough. Those annoying ''ground floor'' tile bugs have finally gone and the air bubble placements are scattered around more evenly. It will get frustrating at first but after a few play sessions you start to learn where everything is and can better zip through the zone at ease.

Scrap Brain Zone:

In my opinion this one's probably the hardest to get through, the graphics are nice and the sky is now dark blue instead of red and orange. There are way too many bottomless pits placed here all leading to death. The conveyor belts are slippery and can run you right into those electric light bulb things that zap you if you're not careful. Act 2 is similar in nature to the original but with a lot more bottomless pits. Act 3 again is similar but has some dickish light bulb placements to make you lose all your rings and the paths are a tad bit more confusing. The good thing is that it is possible to get 100 rings in act 2.

Sky Base Zone:

Surprisingly this one is not that hard at all. The electric beams in act 1 are well placed and the platforming is really good. Act 2 has a slightly different layout where the 1up is better placed in a different location easy to get to. Act 3 is identical to the original.

Final Word:

If you're looking for a decent Sonic 1 SMS ROM hack then this might be for you. It's got a different character as the protagonist, the graphics and colour palettes have all been changed and the level layouts and maps have all been edited to give you a different experience. All Sonic sprites have been removed and changed to Boxguy including on the title screen and the ending credit screen. Some dickish layouts still remain but the game never feels overly punishing and or annoying, the difficulty is welcoming and keeps you engaged to push on to the finish line.

There are still a few bugs but nothing that blocks your path or stops you reaching the exit in each level. I believe it's safe to call it finished as it is though but any further polishing is welcomed.

Well done PoyoPoyo1985 you deserve a pat on the back! 5 out of 5 stars.