Nazo Ou Pocket is a puzzle game for the WonderSwan. The name translates to something like "Mystery King Pocket."  Information on the game's specific mechanics is scant, but it's likely a logic or brain teaser type of puzzle game. The [M] tag may signify a multiplayer mode.  Further details regarding the developer and the precise nature of the puzzles are needed.

Nazo Ou Pocket (J) [M]

Morita Shogi (J) [M][!]