Ok I have given my characters a challenge. were the they are part of 300 teams and each team has 1 of two parts (red or blue) of a key that they have to get the other part of it (as in 1 red and 1 blue key ) off another team the environment is urben and they know, that in the center of the city there is a fortress and in the fort there is a portal. they have to get two in 4 days. I was also thinking of putting in death traps as well.
major note: that the city is swarming with low level undead.
Side note the undead are level 1 they are 4 level 6 characters and the opposite teams are at level 6 as well
did I over do it?