If possible, take the right side; the lava in room 3B will prevent going down to the treasure room 4B.
Save a line Blaster for the second depth, and one for the center room on depth 3 to exit downwards.
Don't go to the next depth before destroying as many Diggy Blocks as possible in one move, and proceeding to the last board on the current depth. But never waste moves on a single Diggy Block, or two. This is truly essential!
After turning at depth 3, look for the room with a lot of mud bombs and lava blocks on the top. On that room, plan to reach the bottom exit by destroying the Diggy Blocks within four moves - before the Bee Bombs explode. If they explode, it is an instant game over due to the sheer amount of them.
After doing that, you will reach the center treasure room, which is two-colored, different than the three-colored treasure room at the sides. Here you can make more points per move than by hitting some Diggy Blocks.
Type A Rooms: 1Y, 1X, 1L, invested with frozen ninjas. Type B Rooms: 1R, 1A, 1B, invested with angry ices. Type C Rooms: 3Y, 3X, 3L, invested with mud bombs. Type D Rooms: 3R, 3A, 3B, invested with lava blocks. Room 1: Starting Room. Room 2: Transitional Room. 2Y is filled with frozen ninjas, while 2B is filled with angry ices. Room 3: Mixture of Type C and Type D.