I am counting down the final days to retirement, so I have been collecting games that I could enjoy as solo game play and I desire games that will challenge me and take a while to solve so that I can play for a while. This game has received rave reviews and 2 specific reviews caught my attention and "sold" me on the game. One reviewer said if you liked Sudoku you would like this game. Well, I love Sudoku! I have the puzzle books, the board game version with wooden tiles for placement and the electronic hand-held game. So I figured Chocolate Fix would have similar rules for placement. Another reviewer mentioned she got stuck on puzzle 14 or 15 (I can't remember the specific puzzle number) and it was an Intermediate level. I figured that was the sign of the game getting more challenging. So I purchased the game and when it was delivered I was so excited.The game box was crunched a tadbit in one corner but that didn't bother me because when I opened it, none of the components had been damaged. One reviewer said she thought the gameboard was about 6x6. I didn't measure but the chocolate candy pieces had a circumference close to a quarter and oh, the pieces were so well designed in a 3 dimensional aspect and they looked like yummy pieces of candy. The visual design is appealing. There's a puzzle book with 60 beginner to expert challenges. The book has a spiral ring at the top like perpetual calendars, so you can open it and display it like an easel. The solution to each puzzle is on the backside of the puzzle you're working. The instruction manual is a generic style black and white printed and folded insert. I think the instructions were printed in 6 or 8 languages but I didn't count them. I am attaching a copy of the English instructions.I read the instructions and immediately noticed a problem: There are NO instructions for placement of pieces AFTER you have placed the initial pieces. Some the challenges, as in the very first one, will be cut and dry with where the starter pieces go. Others will give you the possibility of a piece going in one of two locations, so you assume you need to use deductive reasoning to determine which space is the correct one. Not the case once you realize there are NO rules for how the remaining pieces can be placed.So each puzzle gives you a layout for where some starter pieces can be placed. The very first puzzle was cut and dry...it told you where to place 7 of the 9 chocolate candy pieces. So there were 2 remaining pieces. Sudoku has rules that tell you numbers cannot be repeated in columns, rows, or 3x3 grids. I "thought" Chocolate Fix would have a rule telling you that you couldn't place chocolate pieces of the same color OR shape in the same row or column. NOPE! There is no rule that states placement. And if you look at the picture diagrams I have provided for puzzle 1, you will see that they have already told you to place 2 chocolate pieces in the same row and in the same column, so there goes my thought that there would be rules of placement. So you have 2 remaining pieces to place and NO rules of placement. I saw a few reviews that said some puzzles would have many solutions. Well, IF there are NO rules for placement, how do you know if you are placing correctly other than looking at the solution? I placed the pieces and flipped the page and lo and behold, I didn't have the correct solution as presented on the answer key. But how did the developers come to the conclusion of what was the correct answer IF there are many possibilities? I have attached pictures of what the answer key says was the correct solution and also attached a picture of what the other solution could be.I moved on to another puzzle and placed the starter pieces and the results were the same. You see, without rules for placement of the remaining pieces, all you need to do is place the starter pieces and then randomly fill the board with remaining pieces. Without rules for placement of the remaining pieces there is nothing to explain why their solution is correct and yours is wrong.The game is recommended for ages 8-99, but if you explain to a 4 or 5-year-old that they need to place the pieces from the puzzle book diagram first, well, they can place remaining pieces to their heart's content and win the game because as many are stating in reviews, some puzzles have many solutions.So after working 2 puzzles and getting frustrated because it lacked challenge, I returned the game. I didn't have any problems with my return but this game truly does have potential if the rules were thought out a little more. Just have a rule that you cannot place the same color/shape in same row or column. I tried that way of thinking for a 3rd game but unfortunately, that "rule" doesn't work IF the pre-placed pieces already go against the rule. Thus, in my opinion, there is no challenge or strategic planning. Lots of potential but lacked proper rules before being pushed out.