The Sukhothai region of Indiana Jones & The Great Circle has plenty of puzzles, but the ones associated with Khmer Cogwheels are directly tied to the main story. Unlike optional Mystery quests, some of these puzzles must be solved to progress through the game. While you could stop after finding a couple of Cogwheel solutions, you can complete a few more for some rare rewards.

Unlike other Mysteries in Indiana Jones & TGC that take place in a single location, the Khmer Cogwheel puzzles are scattered all across Sukhothai. You have to travel to multiple places to collect Cogwheel items to unlock solutions for every puzzle. Doing so will allow you to move forward in the story and earn a rare achievement, along with other rewards that will help you get stronger.

How To Find & Start Khmer Cogwheel Puzzles

Encounter Different Gears During The Main Story

The first time you'll find a Khmer Cogwheel is during "The Blessed Pearl" quest in the main story. This takes place as you arrive at the Hidden Pyramid, a location near the northwest corner of the Sukhothai map. This will be the first time where you have the chance to interact with and collect ancient cogwheels made of wood that are part of this area.

Near the entrance of the Hidden Pyramid, you can grab three different wood cogwheels from the walls of the ruins. Keep these for later, as you'll need every possible cogwheel for the other puzzles later. As you venture further into the Pyramid, you'll get to use additional cogwheels to solve a puzzle in the main quest, but you won't get to keep the cogwheels for the remainder of the side quest in Indiana Jones & TGC​​​​​​.

Any puzzles involving cogwheels require you to use small and large cogwheels to fit into spaces near a contraption. Your goal in any cogwheel puzzle is to create a chain of moving gears that connect to get an ancient mechanism to work.

You get three small cogwheels from the Hidden Pyramid, but collecting any will start the "Khmer Cogwheel Puzzles" discovery in your Journal. You have to travel to different locations in Sukhothai to find more cogwheels other than the ones you picked up at the Pyramid. Along the way, you must solve more puzzles at these locations using the wheels you've already gathered.

How To Find & Solve Every Cogwheel Puzzle

Purchase The Right Book And Bring Enough Gears

The easiest way to find every cogwheel puzzle is to buy the Sukhothai Cogwheels Adventure Book from Tongdang, a vendor in the region's main Village. This book can only be purchased once you get the Rebreather in Indiana Jones & TGC. This second item is fairly expensive, so you likely have to search for money around the region before you can narrow down cogwheel locations.

When including the cogs you found at the Hidden Pyramid, there are 7 total cogwheel puzzles in Sukhothai​​​​​. The three cogs you get during "The Blessed Pearl" main quest can be used in other puzzles, but some require more than the gears you started with. Below is a list of each cogwheel puzzle based on where it can be found, and how many cogwheels you need to complete it:

• The Hidden Pyramid - 3 Cogwheels
• Waterfall Ruins - 4 Cogwheels
• Wat Mahathat - 5 Cogwheels
• Wat Si Sawai - 6 Cogwheels
• Village - 8 Cogwheels
• Hidden Platform - 10 Cogwheels
• River Bank - 10 Cogwheels

How To Solve The Waterfall Ruins Cogwheel Puzzle

Traveling to the Waterfall Ruins to the west of Sukhothai will put you on the path to the first cogwheel puzzle after the Hidden Pyramid. Here, search for a totem that indicates where the puzzle is close to the edge of the river leading to this location. You should be able to find a hole in the ground you can drop into to find the puzzle.

You only need small cogwheels to complete this puzzle, which you can find easily. In the Waterfall Ruins cave with the puzzle, you'll find two more small cogwheels to pair with the three you received from the Hidden Pyramid. Simply make sure the small cogwheels connect the southern large cogwheels, then pull the nearby lever to solve the puzzle.

Doing this will open a gate where you can collect an Ancient Relic, an old artifact next to a skeleton. Keep all the cogwheels you have, as you need more of them to solve future puzzles in Indiana Jones & TGC.

How To Solve The Wat Mahathat Cogwheel Puzzle

The Wat Mahathat cogwheel puzzle is almost in the center of Sukhothai according to the book you got from Tongdang. From the northeast section of this area, head south until you reach an upward path where you can see the same totem from the previous puzzle. Same as before, you can drop into a cave to discover the cogwheel puzzle, which has larger cogwheels you can take and adjust.

The Wat Mahathat area is occupied by a fascist camp, whose enemies will attack you on sight. Make sure to pick up the Royal Army Uniform from Voss' Camp to through this area without getting attacked by any enemies.

This puzzle is a little trickier since you have to move the existing large cogwheels in it. Three large cogwheels also exist on the left of the puzzle, but these cannot be moved in any way. Start by connecting the largest wheel on the top of the puzzle to the left gears, so that you can form a chain leading to the slots at the bottom.

From here, use small cogs in the lowest two spaces to the immediate right of the lower-most green wheel. Attach both the larger cogwheels right next to each other to the right, then use a smaller gear to complete the path up to the final immobile gear. This will allow all the wheels to spin, including the partially covered massive cogwheel on the right-most side of the puzzle.

Similar to before, you get an Ancient Relic for connecting to the puzzle with a working contraption. These Relics will be your reward for every cogwheel puzzle until you reach the very last one.

How To Solve The Wat Si Sawai Cogwheel Puzzle

As soon as you enter the main camp in Wat Si Sawai, an area in the southwest corner of Sukhothai, start heading to the left. This ruined site's main structure has a path to the left you can follow until you reach a marsh-like part of the forest. Wade forward through the mud and stay along the right perimeter of the mud before going into a clearing on that side of this area with a familiar totem.

Once again, you can drop into a space containing the cogwheel puzzle here. This one is slightly more complicated, with immobile vine-covered cogs in the bottom left and top right side of the wall where gears can go. However, this puzzle is deceptive, trying to confuse you with details that don't really matter.

Using the bottom left large cog as a starting point, use the large cogwheel on the ground to help connect smaller ones to the vine wheel in the bottom right corner. Then, use the existing large cog to connect a series of smaller cogs along the slotted path going up to the massive wheel in the upper right. This will fully pair both of the largest cogs, which activates the mechanism when you pull the lever.

How To Solve The Village Cogwheel Puzzle

This cogwheel puzzle is directly south of Khaimuksaksit Village, an area you might from the "Child's Play" Mystery in Indiana Jones & TGC. Travel to Tongdang's Hut along the river, then dive underwater while using the Rebreather. You should spot a log you can move while you're able to breathe underwater using this device.

When you move this log, swim through the space it was blocking and resurface. On the land nearby, you'll spot the same totem from the other cogwheel puzzles, along with a hole you can drop into. The puzzle here is a little harder to get to, but it follows the same rules as the ones before it.

Whenever you spot the totems marking a Khmer Cogwheel puzzle, take a picture of it. Taking pictures of the totems will earn you 70 Adventure Points, which can be spent on giving Indiana Jones new skills along your journey.

This puzzle has a lot of large cogs already in place that you can move around. Ignore the immobile cog in the upper left part of the puzzle, but pay attention to the one connecting to the core gear in the upper right. Start solving this puzzle by placing one large cog immediately to the left of the vine-covered wheel in the upper right, then place two smaller cogs on the left past it.

Place seven more small cogs straight below the furthest left one you just put down. After that, place two large cogs to the right so they connect to one another. This will allow both big cogs to connect to the larger vine-covered wheel at the bottom and the other massive cog necessary to make the mechanism work.

How To Solve The Hidden Platform Puzzle

The Hidden Platform puzzle is located southeast of Voss' Camp, along the right perimeter of Sukhothai. You can find this puzzle room slightly northeast of Wat Chana Songkhram as well, so travel along the right-most borders of the river. Dive underwater in the area designated by the Sukhothai Cogwheel book to find another log blocking your path toward a new cogwheel puzzle.

The Rebreather will help you to move the log again while you're underwater. From here, surface from the water to discover a winding path twisting and ascending into a small clearing. This area, like all the others, has a totem and a hole designating this spot as a place with a cogwheel puzzle.

This puzzle has a few large cogs already embedded into it, along with the most vine-covered gears you'll see in any of these puzzles. Do not move the larger cogs on the top of the puzzle, but do take away the one in the bottom left corner. Take this individual cog and place it two slots above the bottom right part of the puzzle to get started.

By this point, you should have the maximum of 10 cogwheels needed for the rest of the puzzles in Sukhothai. With the ones you get from the Hidden Platform, you should be able to complete the remaining puzzles in the region that involve cogwheels.

Place one small cog from your collection above the large cog you just placed, as this will form a connective path to the upper large cogs. From where you put that larger cog, go two spaces to the right and put a small gear into place. Two more gears below that one will create a path to the lower giant cog along with the series of smaller vine-covered cogs in the puzzle.

Finally, from the vine-covered cog to the right of the right-most giant wheel, place one smaller cog up one space. Put another small cog to the right, then another above it. This will cause the large path of large cogs to connect to the lower path you made before, completing the puzzle and giving you another Ancient Relic to grab.

How To Solve The River Bank Puzzle

The final cogwheel puzzle is slightly southwest of Voss' Camp, in a location not too far from the Hidden Pyramid where you started. Once you arrive in the place indicated by the Sukhothai Cogwheel book, you should easily find the totem and ruins right off the banks of the river. Jump into the hole as you've done many times before to start the final challenge, but only if you have all 10 cogwheels that you need.

A larger cog is lying on the ground here, so pick it up as soon as you enter. Take away all the cogs already in the puzzle to clear space and start from scratch. Start by finding the bottom right giant cog foundational to the overall mechanism and the vine-covered small cog directly above it.

Place two small cogs directly above the one encased in vines, then put a larger cog in a slot two spaces to your left. From here, place two cogs directly north of the larger one so they connect to another vine-covered small gear. Next, locate the giant cog in the bottom left corner and put two cogs in the available spaces to the left of it.

From the second cog on the left, put another small cog above it, then one cog to that one's left. Put another large cog two spaces above the small cog you put into a slot last, then put another small cog two spaces above the larger one. This should connect it with another green gear, which you can use as a benchmark to place a final large cog two slots to its right to complete the puzzle.

Activating the lever in this space will reveal a final Ancient Relic, rewarding you with even more Adventure Points. Those who solve all the Sukhothai puzzles associated with Khmer Cogwheels will also receive the "Gearhead" achievement in Indiana Jones & The Great Circle as a final bonus for their efforts.