First of all you will need at least 10 or more people to be the "aliens". These are people who are willing to hide up trees, behind bushes and under benches in the pitch dark for the duration of the game. The rest of the group should be divided into teams named after colours, i.e. Blue team, red team, yellow team, etc. About 5-6 people per team is good. Each team must have one flashlight, which they should try to use as little as possible so as not to give away their location to other teams, especially when finding one of the "aliens".
Each Alien is given into his or her possession, in addition to other objects that you can decide upon, several of those light sticks that are activated by bending them in half. Assorted colours are needed, one for each team colour, i.e. blue, red, green, yellow, orange, purple, etc. Also a number of the stripey light sticks are needed which are worth bonus points.
The aliens should change their positions frequently making them more difficult to find by the teams.
Step 1: The Task
The aliens will not give the sticks away for free, but might ask the players to sing a silly song, or recite a poem, bring them something that they can find on the site (in the dark) or answer a question correctly before they will give the reward. If the aliens are so impressed by the song, answer or whatever they might give out one of the precious stripey bonus light sticks to a team. The teams must be mindful that other teams are in the area also seeking the aliens, so try not to give your location away.
Step 2: Hazards
These wayward players are taken off to jail, where they are held until the rest of their team comes to find them. To obtain their release one or more of the precious light sticks has to be handed over. If the team has managed to find one of the stripey bonus light sticks this has to be handed over. These light sticks are then returned to the various aliens lurking in the shadows for reassignment.
When time is called at the end of the game any team that has "lost" a member and not reclaimed him or her is immediately disqualified. Therefore, it is important that members of the team stay very close together so they can hold hands immediately when a marauder roams by.
Step 3: The End
The points are scored as follows:
For light sticks in the team's own colours - 5 points each
For light sticks in other teams' colours - 1 point each
(note it is possible for a team to exchange light sticks with another team to get ones in their own colour - if they choose.)
For multi coloured stripey light sticks - 100 bonus points
Additional things collected from the aliens (such as silly hats, leis, popsicles, or whatever - 2 points each item.)
Any rubbish picked up at the location in their travels - 1 point each.
Make sure there is a time limit on the game, as it could go on all night!