0 computer programs that you are allowed to use for a short period before you decide if you want to buy them: --
1 software that is available to use and which you pay for only if you wish to continue using it after a particular length of time: --
It was one of the first programs sold using the shareware marketing model.
Purchasing the registered version allowed the player to use the triple-turreted tank as well as removing the shareware reminders.
The first episode was released as shareware, and the rest were distributed commercially.
They still uphold the use of the shareware distribution model, trying to remain "old school" as much as possible.
All recent titles have a shareware/demo version available for free download from the company's website.
There are two versions of the game, the shareware version, and the commercial version.
The emulator was made shareware as for the upgrade, users were charged $10.
It can still be found on old abandonware and shareware download sites.
