Science in the early grades is mostly noticing and sorting: is it alive, what does it need, which way will it move, will it sink or float. Kids learn to make a guess, check it and say why.
Kindergarten starts with living things and what they need, the weather, and pushes and pulls. In 1st and 2nd grade kids look at habitats, plant parts and life cycles, and at materials: what floats, what melts and what changes back. By 3rd grade it's food chains, rocks and fossils, and forces in balance, magnets and static.
How the science games teach it
Every science game reads its questions aloud, so a kindergartner can play without reading. Rounds are quick sorting and prediction questions, and a wrong answer shows the picture and the reason before the next try.
They're practice for what's covered in class, not a replacement for hands-on experiments. Each game's page has a couple of things to try at home, like a sink-or-float test in the bathtub.
What these games line up with in school
Next Generation Science Standards. Standards vary by state, so check with your kid’s teacher. Each standard’s page lists the games that practice it and ideas to try at home.