If you have an email attached to your account you can reset the password here:
Account troubleshooting
My account got split between Steam and non-Steam versions, or between different games
Go to link accounts pageHelp! I never even set an email!
Your account could have been created in two ways:1.) Play a standalone game and type in your name
In this case, to get into your account, you need to play the same game on the same machine and click on an in-game arcade2000 link to "soft login" to arcade2000. You can now set a password (email also strongly recommended in case you forget the password).
2.) Play a Steam game and your account will be auto-generated based on your name.
In this case, you can play the Steam game again and click an ingame arcade2000 link to do soft login and set your password. Doesn't have to be the same machine, just the same Steam account.