timppu: Maybe you are thinking of some early Japanese spin-offs or ports of those early Wizardry games? Maybe some Wizardry expert knows better, but to me there seemed to be two separate branches of Wizardry games, those made and released in the US and those in Japan?
There's more than just 2. Aside from the Sir-Tech Wizardry games (the ones that most non-Japanese Wizardry fans are familiar with), there's many different Japanese branches, which have their own quirks (the fact that they're made by different developers is a major factor here):
* Wizardry Gaiden, which seems to be the most mechanically faithful branch. The internal mechanics are pretty similar to Wizardry 5, though in WG3 they started to add some races and classes from later games in the series. (WG4 is rather interesting, as it has a strong focus on NPC interaction, enough that the game is as much of a WRPG as Wizardry 5 (despite being Japanese developed), and puzzles have multiple solutions, including brute force, charm (in at least one case), and just picking the lock instead of solving the puzzle.)
* Wizardry Empire. The GBC entries are not the same as the PlayStation ones here. You see some original classes in these games. The developers went on to make the Elminage series (including Elminage Gothic, available here on GOG).
* Busin. Two games, the first of which got released in the US (Wizardry: Tales of the Forsaken Land), but the second one is JP only.
* Labyrinth of Lost Souls (first game is on GOG, but the second is still JP-only).
And some others. Note the huge mechanical differences between these branches.
Tempaura: I've always wondered that myself. A real shame
Wizardry V is not available here... such a masterpiece!
Personally I'm more interested in Wizardry 4, as that game is far more unique; I haven't really seen any game like that.
(Before anyone mentions Paper Sorcerer, note that said game may have a similar story concept, but the gameplay is not similar.)