Counter-Strike/Level Design/Hostage Scenario
Hostage rescue was the first and only scenario to ship with beta1 of 
Counter-Strike. It is now often referred to as the "classic" CS scenario.
Setup
Add the "cs_" prefix to your map: cs_mapname -- If your map name was "city" for example, please name your .bsp "cs_city."
Place at max 10 spawn points of each type for each team, as Counter-Strike only supports up to 20 players (any more would be chaos and would make true teamplay difficult).
Put the 10 spawns for each team nearby and in view of each other so each team can start together. Remember not to place a team's spawn too close to the other!
Be careful with spawn placement, keep them 128 units away from each other to prevent telefragging.
Place around 4 hostage entities on the map, close enough so the Terrorists can guard them, but not too close so the Terrorists actually have to move around.
Theming
Your map should be realistic, and in a setting that can be recognized, where you might find a Terrorist group having a standoff with SEALs.
Those playing your map must be able to say "Oh, gee, this is an x map" [where x is a realistic setting such as a bank, factory, office building, library, etc]. Your setting must be recognizable! You should also beef up the realism in your map by adding things such as chairs, tables, gun racks, missiles, bathrooms, etc. Custom textures can make your map feel more unique, just remember to pack them into your .bsp. Remember that Counter-Strike is teamplay only, so the map must be teamplay-specific.
Make sure:
- Your map has at max 10 Terrorist spawns.
- Your map has at max 10 Counter-Terrorist spawns.
- Your r_speeds should not go over 900