I got this notice from Moby Max. There are a proliferation of websites that let you check and have kids working in online spaces like this. Remember that these can be helpful, but you should and must have students programming and inventing with computers. These can be very helpful but are only one use of the computer. Below is what they sent me about the service. Please let me know if you're using this (educators only, please).
"MobyMax has just released the easiest way to get your students motivated and start the year off right—a free 119 prize school contest. Within the first ten minutes of releasing the free 119 prize contest on Monday with no announcement, 22 schools signed up!
Not only are the contest and 119 prizes free, but MobyMax curriculum is free as well. (You may remember that teachers can upgrade to the Pro version for just $79 per year, but the prizes, contest, and curriculum are completely free whether you upgrade or not!)
We are also proud to announce our students’ results from the last school year. The results from over 600,000 students showed that those who used MobyMax for 40 hours averaged more than a 1.4 grade level increase in math and a 1.5 grade level increase in language.
Students answered over 1 million problems in MobyMax’s new reading module released this summer."