- Choose TEAM DEATHMATCH gamemode (for respawns). 
- Turn Fog of War ON
- Set 0 bots. 
- Join CTs
- Use City Map for orientation
- Use "if you get stucked" when you get stucked :D

 If you play with 3+ players, make sure, you have autoteambalance turned off and have high enough "limitteams"  (or wait, it doesnt work like that in cs2d?). 
Also if you plan to get all 25 notes, bring something to write numbers of notes, that you found... so you know, how many you already found.