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The following are the Dip Switch settings based off of MAME 0.180 source code.
 
Use this information at your own risk!  The information was parsed from the MAME source code and could contain errors as to the state, order or descriptions of what the switches do.  If you find an error, please let me know on the Contact Us form and I will work on correcting the issue. 
 
 
 
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Welltris
Manufactured by Video System Co., Released in 1991
ROM Version: Welltris (Japan, 2 players)
Print
Dip Switch:DSW1
12345678FunctionOption
OffOffOffOff    Coin A1 Coin/1 Credit*
OnOffOffOff    1 Coin/2 Credits
OffOnOffOff    1 Coin/3 Credits
OnOnOffOff    1 Coin/4 Credits
OffOffOnOff    1 Coin/5 Credits
OnOffOnOff    1 Coin/6 Credits
OnOffOnOn    1-1, 2-2, 3-3, 4-4, 5-6
OffOnOnOn    1-1, 2-2, 3-3, 4-5
OnOnOnOn    1-1, 2-3
OffOnOnOff    2 Coins/1 Credit
OffOnOffOn    2 Coins/3 Credits
OnOnOffOn    2-1, 4-2, 5-3, 6-4
OffOffOnOn    2-1, 4-3
OnOnOnOff    3 Coins/1 Credit
OffOffOffOn    4 Coins/1 Credit
OnOffOffOn    5 Coins/1 Credit
    OffOffOffOffCoin B1 Coin/1 Credit*
    OnOffOffOff1 Coin/2 Credits
    OffOnOffOff1 Coin/3 Credits
    OnOnOffOff1 Coin/4 Credits
    OffOffOnOff1 Coin/5 Credits
    OnOffOnOff1 Coin/6 Credits
    OnOffOnOn1-1, 2-2, 3-3, 4-4, 5-6
    OffOnOnOn1-1, 2-2, 3-3, 4-5
    OnOnOnOn1-1, 2-3
    OffOnOnOff2 Coins/1 Credit
    OffOnOffOn2 Coins/3 Credits
    OnOnOffOn2-1, 4-2, 5-3, 6-4
    OffOffOnOn2-1, 4-3
    OnOnOnOff3 Coins/1 Credit
    OffOffOffOn4 Coins/1 Credit
    OnOffOffOn5 Coins/1 Credit
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  On     Coin ModeMany Player*
  Off     Mono Player
   On    Demo SoundsOff
   Off    On*
    Off   DIPSW 2-5 (unused)Off*
    Off   DIPSW 2-5 (see notes)Off*
    On   DIPSW 2-5 (unused)On
    On   DIPSW 2-5 (see notes)On
     Off  DIPSW 2-6 (unused)Off*
     Off  4 Players Mode (see notes)Off*
     On  DIPSW 2-6 (unused)On
     On  4 Players Mode (see notes)On
      Off Flip ScreenOff*
      On On
ROM Version: Welltris (World?, 2 players)
Print
Dip Switch:DSW1
12345678FunctionOption
OffOffOffOff    Coin A1 Coin/1 Credit*
OnOffOffOff    1 Coin/2 Credits
OffOnOffOff    1 Coin/3 Credits
OnOnOffOff    1 Coin/4 Credits
OffOffOnOff    1 Coin/5 Credits
OnOffOnOff    1 Coin/6 Credits
OnOffOnOn    1-1, 2-2, 3-3, 4-4, 5-6
OffOnOnOn    1-1, 2-2, 3-3, 4-5
OnOnOnOn    1-1, 2-3
OffOnOnOff    2 Coins/1 Credit
OffOnOffOn    2 Coins/3 Credits
OnOnOffOn    2-1, 4-2, 5-3, 6-4
OffOffOnOn    2-1, 4-3
OnOnOnOff    3 Coins/1 Credit
OffOffOffOn    4 Coins/1 Credit
OnOffOffOn    5 Coins/1 Credit
    OffOffOffOffCoin B1 Coin/1 Credit*
    OnOffOffOff1 Coin/2 Credits
    OffOnOffOff1 Coin/3 Credits
    OnOnOffOff1 Coin/4 Credits
    OffOffOnOff1 Coin/5 Credits
    OnOffOnOff1 Coin/6 Credits
    OnOffOnOn1-1, 2-2, 3-3, 4-4, 5-6
    OffOnOnOn1-1, 2-2, 3-3, 4-5
    OnOnOnOn1-1, 2-3
    OffOnOnOff2 Coins/1 Credit
    OffOnOffOn2 Coins/3 Credits
    OnOnOffOn2-1, 4-2, 5-3, 6-4
    OffOffOnOn2-1, 4-3
    OnOnOnOff3 Coins/1 Credit
    OffOffOffOn4 Coins/1 Credit
    OnOffOffOn5 Coins/1 Credit
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  On     Coin ModeMany Player*
  Off     Mono Player
   On    Demo SoundsOff
   Off    On*
    Off   DIPSW 2-5 (see notes)Off*
    Off   DIPSW 2-5 (unused)Off*
    On   On
    On   DIPSW 2-5 (see notes)On
     Off  4 Players Mode (see notes)Off*
     Off  DIPSW 2-6 (unused)Off*
     On  On
     On  4 Players Mode (see notes)On
      Off Flip ScreenOff*
      On On
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