While researching another subject, I came across a very old thread on these forums surrounding ping pong plug & play games (http://bootleg.games/BGC_Forum/index.php?topic=185.0). Within the thread, a company called "Zinger Software Development Company Ltd.", henceforth "Zinger", was mentioned in connection with some of these games. It was also stated that Zinger is credited in VT01-related documentation, which was leaked online by developer "maxzhou88" in the early 2000s, alongside the "Portable FC-LCD" ROM archive. From my own cursory search, I found that Zinger Software was established in 2001, and was based in Shenzhen, China (https://m.qcc.com/firm/88b9cfe4e9b0b480ff1dfbf0ab01bc0b.html). Notably, Inventor, another Shenzhen-based bootlegger, seemingly ceased operations around 2000; with identifiable Zinger productions (detailed below) seemingly being tied to Inventor.

In the aforementioned forum thread, there was visible confusion between what the Zinger ping pong game actually was; seemingly misconstruing it as being connected to the Gameinis/Cube Technology Ping Pong game (which is a whole can of worms in itself). However, I immediately knew what it was referring to upon seeing the name: a game simply titled "Table Tennis", which has since been attributed as being an Inventor and Nice Code joint-production. The Table Tennis game was also released under the name Ping Pong, and had a cut-down Waixing version titled Table Tennis 2006. As I had already noted on the wiki, the original version of Table Tennis has not yet surfaced; though it was presumably created in 2001, as it was visibly themed around the Osaka 2001 World Table Tennis Championships (with the Waixing version cheaply altering its logo to read 2006).

The Table Tennis ROM features an unused Zinger logo in its CHR data, proving it as being the game discussed in the old thread. There is a second unused logo which I cannot decipher the text of; it features a paper airplane design, however, which is also used on Zinger's logo in the FC-LCD documentation. A Zinger logo is present on the back of the court in another game, Tennis Ball; I assume that the original version of Table Tennis displayed it in a similar fashion. As a side note, the available copy of the Tennis Ball game appears to be its original release: it has a "2001 Copy Right" string on the title screen, which resembles early Nice Code copyright notation.

I have concluded that two additional pieces of software are likely from Zinger as well, as detailed below:

• The first of them is "Quiz", published by Power Joy Ltd. Its Zinger connection is evident by it using the same title screen formatting as Tennis Ball, including having the same face-like cursor next to the "Start" text. As previously noted on the wiki, Quiz has an unused tileset for an earlier version titled "The Way to Millionair"; this is likely remnants of the original Zinger version, given that its graphics contain the "2001 Copy Right" notation.
• The second is one of two English-to-Chinese dictionaries included in maxzhou88's Portable FC-LCD leak. It uses the same background music as Quiz; and with Zinger already being tied to the FC-LCD archive's VT01 documentation, it makes sense for this to be a Zinger-produced program.

There is one further potential connection between Nice Code and Zinger; however, I feel that it is somewhat inconclusive. It surrounds the game 2002 World Cup P.K., which was also leaked online by maxzhou88 (who is the game's self-credited developer). There are several connections between World Cup and the other Zinger productions: it has a spaced-out "Copy Right" notice, and its music is repurposed from the (also maxzhou-leaked) "MusicBox" karaoke demo, which itself ties back to Inventor. Naturally, maxzhou's development ties to both World Cup and the FC-LCD is also a major indicator.

Furthermore, the available design documents for World Cup are signed by "Wofire": a developer who is credited as director for numerous Nice Code productions. This, to me, indicates that Zinger was somehow absorbed into Nice Code, with some of its staff (seemingly including Wofire, but not maxzhou) being transferred over. I would assume that prior to this, Inventor was absorbed into Zinger; thus connecting all three companies. This is somewhat alluded to in a reported post by maxzhou: in which he commented that "a company in Xi'an" (i.e. Nice Code) had produced the 2008 version of Street Dance, based off of the 2000 Inventor version.

I am curious if some further discrepancies could be used to indicate Zinger-affiliated Nice Code productions. I question if factors such as the spaced-out "200x Copy Right" notation are reflective of Zinger games as a whole; whereas most wholly-Nice Code or "Gameventer" ones are more traditionally formatted as "Copyright 200x". Additionally, NESBBS has seemingly taken the liberty of dubbing individual games seen on the FC-LCD as being Zinger titles, including the Nice Code-tied math games; I feel that this is a bit broad of an assumption, but it's certainly possible.

If anyone has additional input or hypotheses on the subject, it would be appreciated. I can provide additional information and sourcing if any mentioned details are too difficult to find.

There is a recently-released mini arcade system known as the "Retro Arcade Gamer" by Kooltech (https://unauthorizon.org/product/recOMTOhDmMDx0Zsh). The console immediately caught my eye: as one of my Classic Player hacks, Wakmole Revenge, is front-and-center as one of the included games. Looking at the full gamelist (via a source detailed below), Puffy's Paradise and Rope, two of my earlier hacks, are also present.

Thus far, this is the only time in which my hacks have been mixed in with a commercial Famiclone release. I've found that this is effectively customary across the industry; the plug & play manufacturers almost never use internet-sourced copies of the games, and their game sets remain relatively consistent with each other. The only exceptions to this are some much older 2000s hacks and homebrews (e.g. Blob Buster and Gradirs), which themselves are still consistent picks among dozens of plug & plays.

However, I found that there is a second line of consoles using the same game set as the Kooltech one. Of all things, it is a series of Paw Patrol-licensed handhelds, released under ID "SG3000" by the company Sameo (https://youtube.com/watch?v=nLkdRUGplbA). Given how many of these things I've analyzed by this point, I can tell that the game list is entirely comprised of internet-sourced ROMs - while still attempting to curate a Nice Code/Inventor-like game pool - which I have to imagine were pulled from ProjectPNP and this forum itself. The rule of consistency is simply not there with the games chosen, even past a few of my hacks being mixed in. As to why, one can only speculate.

While unrelated to the greater point here, I do have to highlight just how absurd the Paw Patrol handheld is. It appears to have 100 more games than the Kooltech one (500 compared to 400), yet the last ~175 games are all unhacked Famicom/NES games (including Pac-Man and Mario is Missing). And no, there is not a single cheap Paw Patrol-themed hack on the thing at all. Nickelodeon really must not care to put their name on this thing...

VT03 games can be placed in a VT02 menu system (such as on the dreamGEAR 75-in-1), so I don't really know what you mean by that...it's theoretically possible for them to be VT02 back-ports, but them being the VT03 versions is more likely.

Here is the proper two-player version of Greedy, as extracted from a recent (technically broken) dump of the Mini Classic Arcade Station. As it turns out, the game is very different than the one-player version, in both coding and general gameplay; so it was likely infeasible to restore it from the 1P version anyway. I have attached both the 1 and 2-player versions below, unaltered.

A pretty random duology here, but I don't believe I've published them before:
*The current extract of Gem (Mowing variant) is a bad dump, and does not run correctly when applied to a multicart menu. I have attached a good dump from the base ROM data of the Retro Arcade FC A6Plus.
*I created a custom hack of Fruit Tree (Toy Factory variant) that makes actual sense to play. In the original game, all of the colored pots are not color-coded to the falling fruits; meaning that you'd have to memorize an illogical pattern of mismatched colors to play. In the attached version, the fruits are properly color-coded to match the pots.

A bit late here, but thank you for analyzing the Smart Millionaire code. Does correcting question 645 by HEX seem to fix performance in any way? It seems to crash after the fourth question in "Player Mode" every time I start a new game, including in MAME.

a Handheld with an VT369 and an SD Card? i wonder if i could run other VT369 NES Roms such as Wave Tiger by Cubetac on this?

Going by the games included, I would imagine it only works with ROMs that use separate CHR-ROM, whereas most originally-programmed VT369 games (including the Wave Tiger example) use CHR-RAM. I don't have a unit to check myself, though.

A few additional hacks sourced from other recent MAME dumps, each of which have some fairly interesting backgrounds:

*Anger Bird 2 (Flipull hack) - This hack originates from the "Play Vision Portable" systems, and was denoted as becoming unplayable after level 4. Going by the ROM itself, this appears to be the result of a poorly-done MMC3 hack; I re-converted the hack's elements to a cleaner MMC3 port of Flipull, thus allowing the game to be fully playable.
*Game Mars of JJ (Super Mario Bros. hack) - A recently-developed variant of Frog Prince that was designed for the "W1 Mini Retro Chick", a handheld modeled after a chicken, for some reason. The hack uses the same chicken as the outer handheld itself.
*Tag Team WWF Smackdown (Tag Team Pro-Wrestling hack) - Generic title screen hack, though it previously appeared on the common 200-in-1 plug & plays with "WWF" ripped off of the title (making it just "Tag Team Smackdown"). I vaguely recall some early 200-in-1 models retaining the WWF logo, though I don't think any dumped revisions retain it.