This is a collection of 40 different hexagonal subtraction/additional puzzle cards (hence, the title above.) It includes a solution recording sheet, so your students can do them in any order they want. These would be best used for advanced first graders (who want to tackle double digit addition), 2nd graders who are practicing single and double digit subtraction and addition, and assessing and remediating 3rd graders and above.
What's nice about these puzzles is that they are "threefers" - that is, it gives your students practice in addition and subtraction (with and without regrouping), but also engages them in using deductive reasoning, as they search for the "entry point" in each of the puzzles. These make excellent diagnostic tools, as they all you to observe students as they work independently to figure out how to use the clues to complete the puzzles.
There is also a "do it yourself" sheet where students can make up their own puzzles and share them with their classmates!
Finally, there is a preview of 8 puzzles which use the same format to have students use deductive reasoning ("if this is true, then this must be true....") to solve the same kinds of problems.