I keep finding outdated, incomplete or plain incorrect information, so one more compilation of all the gameplay tricks as of v1.1.18:
SPOILERS
P1- Rats are looking in the horizontal direction of the Rat King. If they are in the same vertical column, they are standing up instead.
P3- Skeletons - nothing to note (unlike previous versions of the game)
P4- Gargoyles always come in pairs (vertical or horizontal) which are looking at each other (look at their tiny red eyes). There are 4 pairs.
This means if you've got two adjacent boxes totalling 8, high chance of Gargoyle pair.
Pairs of Gargoyles CAN touch each other, so Gargoyles can be adjacent and not looking at each other (there's just 2 more of them in the area).
P5- Green Slimes are revealed by the Slime Witch's dropped scroll.
P6- Minotaurs are guarding chests: every Minotaur has a chest in one of the 3 boxes diagonally or horizontally behind it. Before its chest has been found and opened, the Minotaur is looking AWAY from it; afterwards, it turns around and gets a little annoyed reaction.
This means every chest has a Minotaur in one of the six adjacent diagonal or horizontal boxes (never vertical).
P7- Guardians: there are 4, one in each quadrant of the field (fun fact, their shields are a hint!). Thus they are never in the lines and columns of the dragon.
P8- The five purple Slimes are only ever in a C-formation barrier surrounding the Slime Witch, against an edge of the board. This formation CAN be in a corner.
Thus there is never an 8 value anywhere in the middle of the board.
They're easy to spot as adjacent boxes suddenly climb to numbers around 16, 24 and 32. Go ahead and snipe the Witch in the middle!
P9- The Lovers drop 9 gold AND a healing scroll. Using the Dragon's column as a central axis, they are in the same box in the same row -- once you've found one, you know where the other is.
P10- The Mine King is always in one of the 4 corners of the board (there is often a bomb or mimic in the others). It drops 10 gold and a scroll that deactivates all mines (WITHOUT revealing them).
P5- The Rat King drops a scroll that reveals the location of all Rats.
Any 5 that is not revealed by the Slime Wizard or surrounded with ? boxes is the Rat King.
It CAN be killed for Rat Pacifist stamp.
P5- The Beholders hide all nearby boxes in a diamond (2 in all cardinal directions, 1 diagonally) with a ? until they are defeated. There's only 2 of them.
You can often deduce their position from just one or two revealed ? boxes.
P1- The Slime Witch is always against a board edge and surrounded with P8 purple Slimes, and drops a scroll that reveals all remaining green and purple Slimes. She's only 1 hit, go ahead and snipe her as soon as you find her entourage!
P11- The Mimic's threat value IS counted by surrounding tiles, and there is only one -- once you know where the P11 is, all chests are safe.
It looks and behaves like a regular treasure chest, only triggering when you click it a second time after first revealing it.
P100- The Mines can be disarmed by clicking the Mine King's scroll. They then drop to a value of 0 and give 3 gold (for a total of 27 gold).
This means it's a good idea to aim for the corners so you can figure out where the Mine King is and snipe him the second you have 10 hearts, then collect the Mines gold and level up.
P0- The Chests (but not the Mimic) are guarded by a P6 Minotaur in one of the six adjacent diagonal or horizontal boxes (never vertical).
3 of them drop 5 gold, 2 drop additional healing scrolls.
P0- The Gnome teleports to an empty box when clicked, until there's none left, at which point he drops 9 gold.
You can't literally "corner" him, as even when backed into a corner, he will teleport away if there's any remaining empty box on the board. He does NOT steal/open chests.
Extras (again, as of v.1.1.18):
-The dragon's egg is in one of the 8 surrounding tiles. It costs 0 hearts and drops 3 gold.
- Walls come in pairs (vertical or horizontal), 3 times. They all take 3 hits and give 1 gold.
You can get the Clear Board stamp with walls remaining and less than the maximum score possible. Maximum score (365) does require smashing all walls which makes it notably harder.
- The Dragon has a threat value of 13. You CAN kill it and collect the 13 gold before the end of the game (it only triggers when you claim).
Stamps:
- Lovers Survive: Claim the crown without killing Romeo or Juliet.
- Clear Board: Claim the crown after killing all enemies, including the Lovers and Mines (you CAN have walls remaining; not sure about chests).
- Future Generation: Claim the crown without destroying the dragon's egg.
- Rat Pacifist: Claim the crown without killing any rat (you CAN kill the Rat King).
Multiple stamps can be earned in one game, but not all 4 of them (as Clear Board is incompatible with the others). As of v.1.1.8 it IS possible to get the 3 others in one game ("Full Pacifist Run", lmao), but highly reliant on luck and finding the Rat King really quickly.
Phew! I think I got everything this time. Thanks everyone in this game's community for pointing out all these details over the years.
If there's even more fun facts I missed, feel free to add!

