so a few ideas for in games pits
pits of the same type connect so a line of deep pits would look like one long long hole over a bunch pits with lines of dirt between them.
connected to the early idea. moats. deep pits can be filled with liquid. while yes you could have a ketchup moat. (don’t ask) its mostly going be for water or acid. note a single line of pits turned moats won’t do much a line of 4 bit north and south (aka dirt moat moat moat moat dirt is the best bet) swimmer zombies and agile zombies or large ones could still get past the moat.
burn pit. more of a utility over defense structure. mostly for dumping bodies from hoards that attacked and died…and other items your wanted to burn and get rid of.
compost pit. simile to the burn pit but more for a slow decomp of bodies in to fertilizer.
edit new idea Drawbridge. this is mostly for letting people to make a long line of pits spiked or maot and still be able to bring in vehicles in and out drawbridge would not have a weight limit system so feel free to bring over your tanks
moat notes. since people keep forgetting this i am going to resay a few things.
1 the zombies were used as a example they would not be the only threat that the moat would interact with. they were just the easiest to use being so common.
2 Water is not the only liquid for the moat. any liquid could fill the moat. want a moat of gasoline they go for it. sulfuric acid sure. Blood? i guess not going to be much of a liquid when it clots but whatever.
3 the 4 line thickness is just the base you could have it much thicker