More advanced version of the classical TSW Survival known simply as The Scrolling Survival.
Choose from the multitude of options available to tailor your game to your mood. To get the most of it you should enable the xp mod, otherwise the game may prove to be simply impossible to beat. You can also experiment with other mods available although my personal recommendation would be xp mod and xp mod only.
For those of you who are not familiar with the concept of a scrolling survival - basically you get to kill a lot of bad guys :)
Good luck and have fun!