Game: Play Maze Stopper 2, a free online game on Kongregate

Walls can block players
12 03 00 00 27 63 05
12 03 00 00 26 63 05

Can always delete walls (as long as you place them when the time is frozen - may need to change to 60 A9 02 B3 11 0F instead of 60 A9 02 B3 10 0F)
60 a9 02 b3 12 0f
60 a9 02 b3 10 0f

Placing walls adds mana
66 a5 05 a1
66 a5 05 a0

Credits go to various people