I am a Kindergarten teacher and appreciated that there were two levels of problems for students- with sums less than 5 and more than 5.
*Full alignment to depth and breadth of standard K.OA.1 and partial alignment of standards K.OA.2 In fact it was not at all aligned to K.OA.2 as there were no words or stories associated with these problems, only pictures.
*Has clear learning objectives that are achievable through completion of this resource.
*Has clear assessment strategies that will accurately measure student progress or mastery of the specified standards, but needs additional formative or summative strategies.
*Strengths: The resource easy to understand and use for teachers and targeted learners. The technology features work reliably.
*Opportunities: As Kindergarten does not use symbols for addition and subtraction it would be more appropriate to use the words "and" and "equals/is". Also, the sums for the standard go to 10 and in this activity they go to 12. Depending on where in the scope and sequence of the year this is, students may not know the numbers 11 and 12 if place value has not yet been taught. The graphics would have been difficult for some kindergartners to count. Many students need to use fingers, not just eyes. It was very easy for me to change games and leave the site so a locking mechanism for this game would be appreciated.

This is an interactive activity that students will enjoy.
Full alignment to K.OA.1: Full alignment to depth and breadth of standard(s) tagged.
Not aligned to K.OA.2. These problems are not word problems.

Has clear learning objectives that are achievable through completion of this resource.

Has some assessment strategies that will measure student progress or mastery of the specified standards, but needs additional formative or summative strategies.

2 strengths of this resource: it is engaging and appropriate for a Kindergarten audience. This resource would benefit from the addition of a formative or summative assessment.