CSS SCI FI 3: Hardwired is a mod for the Source SDK base featuring 42 unique single-player missions. Missions are set in 18 retail and 24 custom Counter-Strike: Source maps, which are installed intact to the player's CS:S game folder. The mod edits the entity data for each map as it is loaded, adding and modifying entities to create a seamless single-player experience. The maps remain unchanged and are fully playable in Counter-Strike: Source.
Players enter each map through the mission hub and can choose to play each one at a time or all in 3 linked campaigns. Each mission features a series of goals, such as to rescue hostages or destroy targets, which must be completed to move on to the next map or return to the hub. There are multiple approaches to each goal, and in each map the behavior and armament of enemies and the distribution of resources are randomly determined within defined parameters. Thus, no two plays are the same, making CSS SCI FI a truly replayable single-player experience.
When presented with a total value for spawn flags, you can find out which flags were checked by converting the total from decimal to binary using the above link. For example, to determine what flags the npc_helicopter in d1_eli_02 has checked, enter the total (224 as shown on line 6470 of the entity table) and convert it to binary (11100000). Then click explain answer. This gives you "The number 224 can be expressed as: 128 + 64 + 32". These values correspond to the spawnflags which were checked for this entity.
Amphibian Mods is a collection of working download links to quality single player maps and mods for Half-Life and Half-Life 2, as well as several other games. The site includes instructions for running all maps and mods from the command line.