These are the special games not stuff like hide and seek or tag everyone knows how to play those games. So here you are.
Dark
Needs -
Flashlight and lots and lots of people
(story) the grog is a terrible monster that loves sending people to the edge of death. If a human is touched by this creature they let out a terrible scream and fall down paralyzed. Lucky for those humans they can be rescued by others if they are merely touched and awoken from their slumber. The grog is still on the loose though. If you want ot destroy this evil being one must find the sacred flashlite. The sacred flashlite is the grog's kryptonite and if the grog is flashed or even touches the flashlite it dies a horrible death. This flashlite is the only thing that can kill the grog and its satanic presence, it penetraits the grog and he falls down dead.
(rules and simplified version) have one person (preferably one not playing) hide all the pieces to the flashlite. Once all of the flashlite is hidden choose a person to be grog. The rest of the people are humans searching for the flashlite. Turn off all of the lights and let the grog start off in the area alone before allowing the humans to start their search for the flashlite pieces. The leader might want to add rules or time limits to ensure safety and a fun time. When the game the begins the grog can attack when ever he pleases and the humans can immediately start their search for the pieces of the flashlite. If a human is tagged by the grog s/he should let out a great scream to let the others know where s/he and the grog are. to be saved another human only needs to touch the "paralyzed" human. Once all of the pieces are found and the flashlite is complete a human only needs to shine it on the grog (hopefully there are batteries in the flashlite) and it melts away and the game is officially over.
dark
Needs-
safe and enthusiastic players
(The Story)an evil parasite that lurks in dark corners and shadows is on the loose. Its life-span is less than half an hour. Within that half an hour the parasite has to seek out the living creatures in the area or it will die. These creatures' only defence is to hide or dodge the spying eyes of the parasite. The parasite captures its host the host is stuck behind the seeker until a friendly creature beckons the trapped host away. If the seeker can turn all of teh living creatures in the area into hosts that follow it he survives and takes control of the area as the evil seeker creature, if the creature's time runs out and does not have enough hosts it dies a horrible withering death and ends up as a shrivelled heap on the floor.