ADK Tamashi (aka ADK Soul) is a compilation of video games made and released by SNK Playmore in Japan only for the PlayStation 2 console.
It includes 5 arcade/Neo Geo games which were all developed by ADK and published by SNK Playmore. All 5 are 1:1 arcade ports with only one small enhancement in the form of skill lists/move lists for the characters of the fighting games; nothing else was changed. They are all 2D Games and every game is for 1-2 players. The games are not slower or have any glitches the originals didn't have. Ninja Master's: Haō Ninpō Chō was one of the rarest Neo Geo games.
Unlike all the other Japanese versions of Neo Geo game compilations for PS2, it had no online modes.
Source: Wikipedia, "ADK Tamashii", available under the CC-BY-SA License.