RSC Single Player is a one player RuneScape Classic clone. You do not need any sort of internet connection what-so-ever to play.

• Java 8 or newer

• To launch you can either double click the 'rsc-complete.jar' file, or use the run.bat (Windows) or run.sh (Unix)
• To create a new account, click the "New User" button and fill out the information below
• Login and play

• Experience modifier is set at 8x
• The game can now be resized to your preferred dimensions
• Social tab and "Report a Player" features have been removed for obvious reasons
• Music player preloaded with tracks (off by default)
• Swap bank items by right clicking on the item
• You can use multiple accounts, but do not use more than 1 account during the same session (you can have multiple windows open)

Original post: https://forum.moparscape.org/rsc-server-development-discussion/52/release-rsc-single-player-v2-3/672287/