Here's a 4-in-1 multicart I made to test I-CHR which is a tool to convert PNGs into CHRs. I've used I-CHR on SF-1010 before, but this is the first time I used with a non-emulator screenshot (in this case, the LoveLive Days art of Ren Hazuki from LoveLive Superstar which I found on LoveLive Wiki). The convertion process is not that straightforward - I have to reduce the color in Paint.net and change the palette within NES palette limitations for the best results. The end result is cool regardless. (Also I used a self-modified version of Sonic 3 Special Stage music from Famistudio's examples, of which I removed Namco 163 expansion audio. )

That's interesting, can't wait to try it out. I've made many custom multis before, but I didn't made one with all custom hacks yet (I'm not good at making pixel art for ROM hacks).

V1.1 Update: Fixed problems regarding the FCEUX emulator.
Patch it with a No-Intro Panda Prince ROM.

For some reason there're over half of the game's content left unused in-game (including the Wasp shown in the intro). This hack makes all eight stages and all three boss fights accessable. This hack is based on the MMC3 conversion by NewRisingSun, meaning it can be run on emulators that doesn't support Mapper 121.

The "language select" patch also brings up a language select menu on startup in addition to the above changes, but at the expense of running on an uncommon multicart mapper. In the original game, the language is hardcoded in the ROM.

Technical information:

$06F3: Current level

$06F9: Language (0=Chinese, 1=English)

I've hacked the 3-in-1 ROM to autoboot Saint Seiya. I'm currently figuring on getting the rest of the two games work in standalone form.
Currently the NESDev Wiki doesn't have any info on this particular mapper, but it seems to write to $B000 when selecting the other two games, which I assume it's switching the outer bank of the ROM.


[EDIT: Attachment removed. Download NewRisingSun's extract instead. ]

MAME recently added support of Magical Cooking and Gaoranger DX Soul Bird (both of which are UM6578-based licensed plug 'n plays from Bandai). I've headered them with NES 2.0.
NintendulatorNRS currently doesn't seems to support the Gaoranger controller.

Here're interesting stuffs I found on Chang Da's Educational Cartridges.
1. Individual versions of common Family Basic programs on these kind of cartridges (e.g. Calculator Board, Music Board) and "Letters Invade", done by hacking the extracted Family Basic portion in the ROM. This is actually much easier to do than other Family Basic variants (and even Nintendo's original Family Basic). Unfortunately Letters Invade has incorrect palettes that I may fix later.
*Side note: The educational cartridges has their Family Basic variants hacked to check certain values in the RAM and load the respective program. This variant of Family Basic just happened to have an easy-to-detect part of the checking program. I forgot where it was but you can do a quick comparison between them.
2. Sumangame's "Math Teacher"/"Shu Xue Jiao Shi" game which I've never seen before.
3. An unused menu lurking inside the ROM??? Looks like it was for a scrapped portion of a middle school learning software in the cart.

Alright, I've now fixed the hyperlink so it points to archive.org correctly instead of still pointing to the old Lanzou link.

The problem: It broke the BB Code in this thread. I don't know what caused this to happen.