Fun Brain
Fun Brain: Number Cracker (Number Series Game)
The Number Cracker needs you to help find a secret code by identifying the missing number in a series.
Other
Saskatoon Public Schools: Sorting and Patterns
There are a variety of activities here for students to practise identifying and creating patterns.
Other
Math Stories: Finding a Pattern
At this one page site, you can work through step by step a sample problem that illustrates the problem-solving strategy for "identify a pattern." The answer is right there to help you check your thinking.