A downloadable game

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This game is a "Connect Four" clone. It is a two-players, one-player and zero-player connection board game, in which the players take turns dropping colored tokens into a seven-column, six-row vertically suspended grid. The pieces fall straight down, occupying the lowest available space within the column. The objective of the game is to be the first to form a horizontal, vertical, or diagonal line of four of one's own tokens.

This game was ranked third in the  "Forza 4" Challenge of the RetroProgramming Italia - RP Italia group. 

This game has been programmed from a single source code for every platform by using ugBASIC, a BASIC dialect specialized in programs that are very efficient "by design" on various 8-bit platforms, without the need for "fine tuning" them and without compromises of other dev-kits.

This is an Open Source software, and sources are available here.


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Click download now to get access to the following files:

4GRAVITY! for Dragon 64 (bin) 20 kB
4GRAVITY! for Commodore 64 (prg) 23 kB
4GRAVITY! for ATARI 400/800 (xex) 23 kB
4GRAVITY! for Olivetti Prodest PC128 23 kB
4GRAVITY! for Commodore VIC-20 23 kB


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Hello, I have a question. You are the author of ugBASIC and ugBASIC is a language(and compiler) for game development for different 8-bit platforms.  I am curious. Will ugBASIC also support 8088 cpu, etc. in the future?  

(1 edit)

Hello, and first of all, thank you very much for the comment! 

Yes, I am the author of ugBASIC. Support for the Intel 8088 processor has been added to the future task list, along with any home computers that have it, which will be the target of the build. For more information and updates you can refer to this page on GitHub.

Thank you again, and have a nice day!

Hello, I see. Thanks for explaining!!