I had to write a review for this game, because contrary to the 2 negative reviews, IT WORKS FINE!
This game is even great for children or adults as each puzzle can be played with 5 piece counts, 12, 35, 70, 140, or 280. The only reason I say this game is for casual puzzlers is that the piece count only goes up to 280, and most hard-core puzzlers yearn for higher, and more difficult piece counts. The pictures are beautiful and varied, and there are a number of DLC that can be purchased for even more variety.
When you start the game, you can choose to play in windowed mode, and also select different resolutions, graphic quality, and monitor (if you have more than one). Also, when you start the game, you need to choose whether to play the main game, or select a DLC as they are not all combined into the main game. When you select a puzzle, it asks you to choose the piece count you wish, and also lets you know that a puzzle is in progress, or that you have completed a certain piece count, which I found very handy! The pieces are lined up on the side of the puzzle board, so you just drag the piece that you want onto the board to place it. The side can be moved up or down to search for a piece, or to just see different pieces. There is also a shuffle button if you don't want to scroll up and down to find pieces, or group the outline pieces together, which can be helpful for younger puzzlers!! I find this to be a nice change since the puzzle board area is larger so you don't have to magnify everything. The pieces do not snap to the board, rather snap to each other so you can put together groups of pieces and then connect them where they belong later. There are 12 background color choices for the board, and you can choose to play with sounds and music on or off, which I find to be nice features.
I will be buying ALL of the DLC also since it is VERY cheap, especially when on sale! If you like casual puzzling, or have children that like jigsaw puzzles, this is a MUST buy in my opinion! I rate this game 10/10!!

Not sure why there are negative reviews for this. But I haven't had any problems with pieces connecting on any of the difficulty piece counts. Also have tried several DLC's and they work fine also. I have a very basic graphics Win 10 i3 computer...no issues. Puzzle pieces don't rotate which may or may not be to your liking. Tho for someone with hands that hurt easily...this is a better alternative to some other jigsaw games. I turn off their background music and play my own playlist. Price is great when bought on the super sales. Never spent more than 49 cents on any DLC...wait for the sales.

Positives+++
+I like that there is different setting for the reference image (no reference, small reference, full board size reference).
+I like that at the end of a puzzle you can see the time it took to complete it.
+I like that the corner piece have a white border making it even easier to see which one is a border piece!
+I like that there is a button to show only corner pieces.
+I very much like that there is a progress bar on each puzzle size of each puzzle :D
+I like the "complete" text under the puzzle size of each image.
+I like that pieces don't snap to the board but snap to each other.
+UI is nice
+There really is a lot of puzzle to do! 8 categories with each 10 puzzles, making it a total of 80 puzzles with 5 difficulty (12, 35, 70, 140, 280)!

Observations and suggestions~~~
~Some of the background choice just doesn't make sense. Why would I want a rainbow background? It doesn't enable me to see any of the pieces correctly. More background option with neutral color whould be better in my opinion (with no texture).
~Mouse wheel to scroll through unplaced pieces is ridiculously slow. This game seems to have been created for touch devices, but is lacking fonctionality for computer users.
~There are some UI things that don't fit the overall theme: redo, continue and close icon when a puzzle is finished. They look like they come from another game instead of the same game. They all have different stroke size and color.
~It would be nice to have an option to disable click and drag in the loose pieces to the right. I want to place the pieces that are there and something I missclick and it drag the pieces. I would prefer it to not move so that I don't accidentally scroll it instead of picking a piece. Also, 2 columns of pieces would be nice instead of 1.
~It would be nice to see best time on the puzzle selection screen. For the moment, we only see the time it took at the end of a puzzle, but the time is not displayed anywhere else.
~It would be nice to have achievements

Negatives---
-No option to modify increase/decrease sound and music (but you can disable/enable it altogether, which is nice but not what I was looking for).
-There is no way to reduce or increase the size of the reference image when it's in a movable window. Because the reference is over the pieces, it makes it hard to work with, without always toggling it or moving it around to be able to see the pieces.
-Collision on puzzle piece is not super accurate. I can pick up a piece without touching it (by the hole).
-I wish there was a way to reset a puzzle
-There is a bug with all puzzles of the image of "Jigsaw puzzle 5". The puzzle doesn't load the correct image. Example: orange sunset load blue winter landscape with a forest. O.o After browsing in the puzzle selection screen, the behavior is sometimes back to normal.
-DLC are not included directly in the main game. When clicking the "Play" button from Steam, you have a series of radio buttons with all of the DLCs. It think it would be nicer to have them integrated in the main game instead of selecting them on start.

Overall, the price is cheap for all of the content there is to play. Puzzle snaps together. Saving of puzzles in progress. It's one of the nice puzzle game on steam. A few negative things and a bug that can be fixed, but I think it's a great game. Good job to the dev :)

Good selection of puzzles. I like that you can select to view edge pieces only and there are options to show the reference picture or not. The pieces snap to each other but sometimes don't want to snap together even when its the correct piece, especially the edge pieces. I like the different size selection. The piece selection and scrolling does not work well at all. I often click on a piece and the mouse doesn't pick it up or try to scroll up but it selects a piece instead, and the scroll speed is slow to the point of being almost unusable. The mouse wheel should scroll through the pieces and it should be a lot faster. I'd also like to be able to access the DLC through the menu instead of the play button on Steam.

Pieces are squeezed into the sidebars, image squeezed into center, unused space between piece columns and the image. Can't rest pieces there temporarily. Worst: Pieces let go are 'tossed' by the game in undesired places, overlapping often with others which makes this puzzle unusable. I saw better puzzles.
Music is just on/off, no volume control.
Pity as I liked the images. But those controls are much worse then from other puzzle games.

Bugged, pieces won't connect

This is a no brainer. If you like a relaxing pick me up game, then this is well worth the very low price. Excellent game. Controls are easy, intuitive and well designed.

Very enjoyable. Recommended.

I love doing these puzzles..... there is nothing that relaxes me more in these crazy times.

relaxing, enjoyable past time. Only complaint is I wish I could scroll the pieces easier as a lot times game just makes me pick up pieces when I'm trying to scroll

Does not work