Balin's Tomb Revamped

Remember the Balin's Tomb map for RoC where all you did was tomb for an hour then kill and kil masses of units? This is nothing like it. It is a short map inspired by the previous one said that has some puzzle elements to it but mostly relies on team work. It is pretty difficult though and impposible with 1 player...or 2 or 3 or 4...