Details: Many secrets are missing (only ~66 secrets found out of 149) and the numbering is a bit off. It goes by areas and doesn't reflect the order in which they can be found. Also, more images are needed.
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In the area where there is a grate to unlock, in the northwest, there is a shiny skull. Interact with it to open a passage to a secret room. Rewards: 25x golz, 2 x food, stuff, thoughwood ladle of the chef (in chest)
#3. Entering from the village, the southwest house has a toilet which when flushed rapidly will give up it's secret. Reward: necromancy for dummies.
#4. In the area with the magic portal message, the room to the left is sealed with a metal gate. Between the two alcoves nearby is a light-colored brick which can be pressed to open it. Rewards: golz, food, shopping bag
#5. After crossing the magic portal, the archway north opens up when the extinguished candle to the left is clicked. Rewards: golz, dead hand, alchemy phial, and a message informing you that you can read.
#6. In the room with a gated passage south of a long north-south carpet, the statue to the right has a protruding plaque. Click on it for rewards: golz, a checkpoint crystal, and a secret exit from the crypt.
#7. North of #6, the archway with the green arrow opens from the statue to the left. Reward: a beautiful vase. Also, a passage around the sealed stone doors.
#8. In the room with three barred passages, the archway along the east wall opens with a click on the east tombstone. Rewards: golz, food, 11x fire nuggets and a checkpoint crystal.
#9. The room north of the black guard encounter, where his spirit appears, the skull in the northeast alcove slides the fake sarcophagus aside. Rewards: lots of golz, quiver of the ranger, nails squeezer, 5x water nuggets.
#13. A treasury is in the northwest corner. After speaking with the Queen, the guard standing along the eastern wall will leave, and you can walk through the opening. Rewards: golz, purse, MacGuffin's crown, key to MacGuffin's crypt.
#14. Below the prison, on the north end of the cavern with a passage through murky water, the statue to the right of the north magic portal opens a door between the braziers. Reward: golz, food, diabolic flail of the black guard, 6x air nuggets and a famished gate (opens for 75x food) leading to more golz, food, 5x fire shards and a spaghetti altar.
#17. In MacGuffin County, along the southern edge of the mountain range around Snow Mountain, there is a single dead tree. Enter that for the reward: a merchant selling 12 of each Primary nuggets for 12x dead hands.
24. Touching each of the lamposts around the village bridge opens a door to the left, past the boulder. Rewards: food, reagents, stuff, 10x fire nuggets, a resource box, 6x knowledge nuggets, a cauldron and a mana spring. Past the mana spring is an alchemy phial.
#25. The Inn southeast of #23 can be entered by clicking the center of the wall. Rewards: stuff, golz, 1/2 price reagent merchant, a sacrificial chicken and a checkpoint crystal.
#26. The path to the right of #24 leads to dead end concealing a hidden passage. Go through that for Rewards: golz, reagents, and snake's bracers of the sorcerer.
#27. Down the ladder past Death's throne room, click the outlined brick in the east wall to open the archway to the right. Rewards: golz, resource box, and 6x knowledge nuggets.
#30. At the stairs down from Violet MacGuffin, the statue to the left slides aside a bookshelf directly south, revealing a void gate. If you return back out of the void gate to the Mage tower, go downstairs to lower floor
Rewards: void, a vest, 5x water nuggets, 11x earth nuggets, and a shortcut to Iota's house.
#31. In the room with the necromancer's spirit are five buttons (outlined bricks.) The sequence 3, 4, 1, 5, 2 opens the archway behind the spirit. Rewards: golz, reagents, 2x dead hands and a lich.
#32. At the bottom of the chasm, west end, a row of bones leads toward a stone archway. Click the archway to enter. Rewards: golz, 5x knowledge nuggets, a dead hand, holy whip of the warrior, a spaghetti shrine and a lever that opens the gates across the bridge above.
#41. South of #37-38, the eye on the eastern building opens the door. Follow the path west through the wall. Rewards: golz, food and stuff.
#42. Inside a building to west, click the orange pot on the right. Rewards: 11x fire nuggets and 12x ether nuggets.
#43. Inside the Labyrinth, along the right-hand path. On the north wall of the maze is an outlined brick which opens the door to the right. Rewards: golz, reagents, stuff, 4x fire shards and 6x ether shards.
#44. Along the left path, the wall directly behind the aristocrat opens a secret door. Rewards: golz, reagents, 5x earth shards and 2x water shards.
#45. In the shack on top of the mountain, the fridge slides aside to reveal a ladder. Rewards: golz, void, air nuggets a spaghetti shrine and a void gate which contains void, 2x air shards and a vest.
#46. From the mine entrance, one track splits off to the east wall. Through that is Rewards: golz and 12x ether nuggets.
#47. In the room where a blue cube is seen, the grave marker west of the first ladder opens a passage in the north wall. Rewards: golz, reagents, 10x ether nuggets, a sacrificial chicken, a mana spring, and a checkpoint crystal.
#51. On the right side of the exterior is a statue holding a sword. Walk in front of it to drop below and flip the switch to reveal the stairs back up. Rewards: golz, stuff, reagents, 12x earth nuggets, a sacrificial chicken and a checkpoint crystal. You can also skip this at first and collect it with another secret later.
#52. The invisible bridge forks invisibly to the left. Rewards: golz, food, a spaghetti shrine and a Piggy bank. Standing in front of the pillar south of the red chest drops you into an area with more golz, void, 12x fire nuggets, 5x water nuggets and a void gate. Through the void gate is more void, a void accumulator and 2x knowledge shards.
#53. On the outside of the treasure room in #51 is a statue wielding a sword, which drops you into another room. Rewards: golz, reagents, mortar and pestle and 12x earth nuggets.
#54. Office level - on the west end of the cafeteria, follow the light colored tiles through the wall. Rewards: Big-Events Hat of the chef, Big-Events Apron of the chef, and Big-Events Ladle of the chef.
#55. On the north-west part of the right section of the Laboratory level, the ladder can be reached through the hidden passage. Rewards: void and a void merchant.
#56. On the far left of the Laboratory shop is a secret path that loops north and back east to the area behind the counter. Rewards: checkpoint crystal, Curse Removal, and gem converters to make Primary nuggets into Secondary nuggets, Primary nuggets into Primary shards, and Primary shards into Secondary shards.
#57. Enter any of the evil clones' apartments after you get their keys. Rewards:
SuperCool Staff of the wizard, SuperCool Tunic of the wizard, Supercool Hat of the wizard, Arcane Flame Rod of the sorcerer, Alligator's Bracers of the sorcerer, Alligator's Amulet of the sorcerer,
Rightful Mace of the cleric, Rightful Chainmail of the cleric, Rightful symbol of the cleric, Chic Longsword of the knight, E Plate Armor of the knight, Exaggerated Large Shield of the knight
Horse Buster Sword of the Barbarian, Yob Underpants of the Barbarian, Yob Belt of the Barbarian, Allbreaker Flail of the black guard, Bad Bad Banded Armor of the black guard, Bad Bad symbol of the black guard
Familybreaker Dagger of the rogue, Disrespectful Cloak of the rogue, Unpolite Shoes of the rogue, Very long bow of the ranger, Exaggerated boots of the ranger, Exaggerated quiver of the ranger
#58. The tombstone (marked with LK -up arrow) on the right end of the path around the pond disappears to reveal stairs down. Rewards: golz, 3x air shards, 6x fire shards and a spaghetti shrine.
#59. West of the gingerbread church is another marked tombstone. The tombstone north of it hides another stairway. Rewards: golz, reagents, food, a lunch box and a sacrificial chicken obstructing 4x earth shards.
#60. South from the church, a lolly-pop tree conceals a switch that opens a stairway nearby. Rewards: golz and 2x knowledge shards.
#64. In the swamp-like part of Demon Island, north of the jungle and east of the barren terrain, there's a secret "chef's camp" close to the center of the island represented by a small tent icon on the world map. It leads to a small area with food resources and reagents.
At the center of the area, there's a chef next to a chef's cauldron but the island is inaccessible. You have to find and activate 3 switches to unlock 3 wooden boards: 1 is visible, 2 are hidden behind trees with thorn bushes close to them.
Once you find and activate all the switches, go to the central island, there's a small green chest with chef's Cosplay IV inside. The chef will sell it to you for 50x soft leaves rolls. Rewards: food, reagents, chef's Cosplay IV. Cost: 50x soft leaves rolls.