We found a post today which introduces a cool mod with an interesting hide and seek gameplay!
Of course, we don't want to keep this from you:

Team Fortress 2 Mod: PropHunt

PropHunt is a funny mod, which combines hide and seek childsplay with Valve's team-based game. The principle is classic and simple: one team has to hide from the other as long as possible. The red team is spawned as random props which are chosen according to the current map and setting. You have 40 seconds time to find a fitting spot where one doesn't look deplaced before the Blu team consisting of Pyros and Heavys comes for you.

The catch: Pyros and Heavys can't shoot aimlessly, because every attack costs some of your health. So you can only perform quick checks on suspicious/moving objects. Every player has the chance to gain full health on a control-point in every map, but this attracts the hunter's attention or costs time for the attacker. 2:20 for every round isn't always enough.

Unfortunately, the gametype itself is a bit buggy and there are only few servers with this mod, so you most likely will not get a slot. It might take a bit longer to wait for a slot, but it's totally worth it!

We like this mod and every one who finds fun in playing a creative new gametype should definitely give this one a try!

Current Serverlist (source):

• UK (GamingMasters.co.uk #5) 32 slots - 81.19.212.48:27019
• UK (GamingMasters.co.uk #6) 32 slots - 81.19.212.48:27029
• UK (GamingMasters.co.uk #7) 32 slots - 81.19.212.48:27028
• UK (HampshireHeavies.co.uk) 20 slots - 217.146.85.240:27055
• US (ClanAO.com) 32 slots - 74.63.81.76:27015
• US (ClanAO.com) 32 slots - 66.90.103.192:27032
• New Zealand (ClearnetDeluxe.co.nz) 32 slots - 203.97.27.199:27035
• Japan (26 slots) - 222.225.240.181:27016 (localised)
• Italy (WantedGoV.it) 28 slots - 194.177.96.192:27055 (localised)
• Middle East (Gamer.co.il) 24 slots - 80.179.149.60:21000

To reduce the download-time, you can preload some of the modified arena maps here, according to the list of all available Prop Hunt maps.