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This has been solved. you may still look at the non-working code and working code.

So for my Merge Chickens game, I have a limit of 64 chickens because there are only 64 save spaces, but when I try to make it so I can save more chickens all I get is:

here is my code:

 
--savebuk() and loadbuk()

function savebuk()
	local d=0
	for x=0,15 do--go thrugh all of
		for y=0,15 do--the map tiles
			local i=0
			local s=0
			if mget(x,y)>63 then
				i=mget(x,y)
			--if this tile is a chicken
			--set i to the sprite number
			end
			if x+1<16 then
				if mget(x+1,y)>63 then
					s=mget(x+1,y)*1000
				--if the tile next to the
				--tile at x is not off the
				--map and if the tile is a
				--chicken set s to the tile
				--times 1000
				end
			else
				if mget(0,y)>63 then
					s=mget(0,y)*1000
					--if the tile next to the
					--tile at x is off the map
					--do the same thing but
					--with zero
				end
			end
			dset(d,i+s)
			--save i+s here is an example
			--i=109
			--s=72
			--s gets multiplied by 1000
			--s=72000
			--s+i=72109
			--then save that is save spot
			--d
			d+=1
			--on to the next save spot!
		end
	end
end

function loadbuk()
	for d=0,63 do
		--all commented lines is an
		--example
		local val=dget(d)
		--val=72109
		local s=flr(val/1000)
		--s=72.109 rounded down
		local s2=flr(val/1000)*1000
		local i=val-s2
		--i=72109-72000
		--i=109
		local x=flr(rnd(15))
		local y=flr(rnd(15))
		--find a random position
		if mget(x,y)<64 then
			mset(x,y,s)
			--and if there is not a bird
			--already there place s
			--there
		end
		x=flr(rnd(15))
		y=flr(rnd(15))
		if mget(x,y)<64 then
			mset(x,y,i)
		end
		--do the same thing with i
	end
end

This is the WORKING code

 
--savebuk() and loadbuk()

function savebuk()
	for sp=64,127 do
		local num=0
		for x=0,15 do
			for y=0,15 do
				if mget(x,y)==sp then
					num+=1
				end
			end
		end
		dset(sp-64,num)
	end
end

function loadbuk()
	for sp=64,128 do
		local num=dget(sp-64)
		for i=1,num do
			x=flr(rnd(15))
			y=flr(rnd(15))
			if mget(x,y)<64 then
				mset(x,y,sp)
			end
		end
	end
end



So your save function loops over every row and column on the map, generating some i and s numbers, and saving that to persistent memory. d is an index saying which memory slot you're saving to.

One issue is that no matter what your i and s are, you're always incrementing d, and setting memory. Even if nothing is there. So you're saving a bunch of empty tiles, then running out of room with dset.

So probably only increment d and save when you find something. I guess the location of the chickens doesn't matter, but when you load, your random x,y coordinates could overlap with another bird, so you could lose some that way.

Hopefully this helps. It's a bit hard to follow, because the variable names mean nothing, and there are no comments, explaining what's going on.

@patsen29 I will add some comments explaining what's going on. thanks for your help!
EDIT: added explaining and example comments
EDIT2: Yay! I solved it! thanks @patsen29



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