Is it possible to..?

in that case you want to set up a sort of "event" counter, that fires based off of what happens and what will happen.

local counter = 1
local sequence = {"a","b","q","c","d","g"}

for i,v in pairs(script.Parent:GetChildren()) do --idk if this is against the rules...
	if v:IsA("TextButton") then
		v.MouseButton1Down:connect(function()
			if v.Text:lower() == sequence[counter] then
				if counter < #sequence then
					counter = counter + 1
				else
					print("Sequence complete")
				end
			else
				counter = 1 -- they messed up, start over.
			end
		end)
	end
end--the ideal is possible, yes. You can create a secret passcode entrance or whatever.
--however, this script is a rough form of what i would deem a possible solution.

this goes off the assumption that the text of the buttons are the same as the sequence table. but the same logic goes, as long as you have the right idea.