12 sounds good though for a normal group of roleplayers. On average a group is 4-5 players. You need at least 2, preferrably 3 angels per player to be sure that they can never keep all of them in sight at the same time.
The 4 in the TV episode were good for the 2 main characters to be wary of. Less than a 2 to 1 ratio would make things too easy.
I thought of a mechanic just now to cover the blinking - for all those savvy players who want to open just one eye at a time. Fatigue and clumsiness are big factors - the trick is to not at any stage close both eyes. So while closing one eye - the other eye must already be open. That's not something that comes naturally. Usually when you swap open eyes, you close one while opening the other - which leaves a few nanoseconds of both eyes closed.
What this means is, that attribute checks should be made to remember not to ever close both eyes when swapping. This check should be modified over time for fatigue and the repetative nature of the task.
"This is my timey wimey detector. Goes ding when there's stuff."
The players would only know of the mechanics if they worked out the one eye blink think - I'd tell at that time. The whole point of them is to increase the tension and fear - so there needs to be no way that players can be 100% safe from them.
I haven't used a playing area in years - generally all players are familiar enough with a location and use of language to describe where they are that they have a good idea of where everything is. Plus - vagueness on locations adds to the fear, an added bonus.
Nothing kills empathy more than turning an RPG into a wargame. Once you start working on stats alone, line of sight, covering arcs - you're not thinking about what it is LIKE to be there. You're thinking what is best for your unit.
Those are very nice indeed, Scarecrow. Thanks for sharing your work. The TARDIS looks like fun to build, providing you aren't a clumsy oaf, i.e. me. Still, I'll give it a shot, although I sense a lot of swearing in the future.
"That is the dematerialising control, and that over yonder is the horizontal hold, up there is the scanner, those are the doors, and that is a chair with a panda on it. Sheer poetry, dear boy. Now please stop bothering me."