Secrets (8)

Claim the northern hemisphere by digging south, securing most gold but avoiding areas '1', '2', and '3', and the rightmost section of western gold to avoid early attacks. Ignore the graveyard for now and focus on the gold in the far NE corner. Dig to the gems by excavating only the gold against impenetrable rock for infinite funding.

Build essential rooms, research the Torture Chamber, and train Dark Mistresses. Consider training Trolls and Bile Demons for a future Horned Reaper. Recruit the Mistress (level 5) located east of '1' between gold and rock.

After researching the Guard Post, defeat the group at '1', claim the southern gold, and build guard posts along the waterline, followed by a locked door, to prevent attracting hostile Tentacles and Samurai from the unlocked door at the bottom '7' area.

Dig west to find 2 Hellhounds (level 4) for manufacturing. Be cautious when going for the "Increase Level" special between '1' and the Mistress, as it is trapped with Poison and Boulder traps.

Dig into the lake and ward it off with Guard Posts and a locked door. Train creatures and fight through the hero fortress to reach the blue keeper. Alternatively, cast maximum powered "Invisibility" and "Speed" on an Imp, place it outside your main dungeon, and possess it.

With the possessed Imp, move around the lake's vicinity and dig into the blue keeper's domain on the other side. Do this quickly as invisibility is lost upon digging, and Samurai (level 10) have "sight". Aim to dig between the two sections of solid rock where the blue keeper may still be excavating gold blocks and the area is not yet fortified.

Once a connection is made, retreat and break through the earth at section '15' to release 2 more Giants (level 10).

To ensure the blue keeper's destruction, release the heroes in the southern points '14' to '16'. Wait for the Samurai to enter the blue dungeon, then return with your Imp to that section and release them.