WonderSwan:WS Flash Masta USB

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The FlashMasta is one of the oldest multirom flashcarts available for the WonderSwan. Instead of being microSD based, this cartridge has onboard storage and uses a microUSB cable to connect directly to your PC. It supports up to 16 slots for ROM files (The first game slot is usually reserved for the menu file so you can select more that one rom), and has one save file slot. Until recently, all games share the one save slot, meaning you lost progress when switching roms. But the new WSCartFriend menu automatically switches saves when changing games. This menu is experimental, but still recommended over the official menu.


Unfortunately, the FlashMasta does not have perfect compatibility with all WS ROMs. Below is a compatibility list pulled from the freeplaytech forums[1].

Due to hardware limitations, the following roms from GoodWSx v3.27 do not work with the WS Flash Masta v5.1:


  • Battle Spirit - Digimon Frontier (J) [!].wsc
  • Beat Mania (J) [M].ws
  • Cho Denki Card Battle Yofu Makai Kikuchi Shugo (J) [M][!].ws
  • Digimon Tamers - Battle Spirit (J) [!].wsc
  • Digimon Tamers - Battle Spirit V1.5 (J) [!].wsc
  • From TV Animation - One Piece - Grand Battle Swan Colloseum (J).wsc
  • From TV Animation - One Piece - Niji no Shima Densetsu (J) [!].wsc
  • Guilty Gear Petit (J).wsc
  • Makaimura (J) [M].ws
  • Meitantei Conan - Majutsushi no Chousenjou! (J) [M][!].ws
  • Meitantei Conan - Nishi no Meitantei Saidai no Kiki! (J) [M].ws
  • Meitantei Conan - Yugure no Koujo (J) [!].wsc
  • Rockman EXE N1 Battle (J).wsc
  • RUN=DIM Return to Earth (J) [!].wsc
  • WonderWitch [FreyaOS 1.2.1].ws
  • Yakusoku no Chi Riviera (J).wsc

EEPROM (save issues)

  • Puzzle Bobble (J) [M].ws
  • Tetsujin 28 Gou (J) [M].ws

Patchable Games

The games below can be patched to allow saving to the flash cart. The .ips patches can be found on GitHub (mirror).

  • Another Heaven - Memory of Those Days
  • Buffers Evolution
  • D's Garage21 Kobo Game - Tane Wo Maku Torii
  • Digimon Tamers - Brave Tamer
  • Digimon Tamers - Digimon Medley
  • Digital Monsters Card Game ver. WonderSwan Color
  • Dragon Ball
  • Engacho!
  • Fever Sankyo Pachinko Simulation For Wonderswan
  • Final Lap 2000
  • Final Lap Special
  • Flash Koibito Kun
  • From TV Animation - One Piece - Mezase Kaizoku Ou
  • Gensou Maden Saiyuuki Retribution - Hi no Ataru Basho De
  • Golden Axe
  • Gorakuoh Tango!
  • GunPey EX
  • GunPey
  • Hunter X Hunter - Ichi O Tsugu Mono
  • Hunter X Hunter - Shirube Kareshi Mono
  • Hunter X Hunter - Sorezore No Ketsui
  • Inu Yasha - Kagome no Yume Nikki
  • Ito Junji Uzumaki Noroi Simulation (Swirl - Curse Simulation)
  • Kinniku Man Second Generations Dream Tag Match
  • Kinnikuman Second Generation - Choujin Seisenshi
  • Kurupara!
  • Last Alive
  • Lode Runner for WonderSwan
  • Nazo Oh Pocket
  • Nice On
  • Ouchan no Oekaki Logic
  • Pocket no Naka no Doraemon
  • Raku Jongg
  • Ring Infinity
  • Senknow Millenium
  • Shin Nihon Pro Wrestling Toukon Retsuden
  • Surizer Link
  • Tare Panda no GunPey
  • Terrors 2
  • Tetris
  • Tonpusou
  • Tortoiseshell Cat Holmes Ghost Panic
  • Turntablist - DJ Battle
  • Uzumaki - Denshi Kaiki Hen (Swirl - Magical Edition)
  • With You - Mitsumete Itai
  • X - Card of Fate.IPS