Jump To Next Cell After X Seconds

1. Create a worksheet for each set of tables (Sheet1: 2x table, Sheet2: 3x table etc)
2. In field A3 (e.g.), I'd type (Formatted as text): 2x1=
3. In field B3, he'd have to type the answer. To prevent him from using the cell as a calculating tool, it will be formatted as text (courtesy of Prevent Someone From Entering A Formula In A Cell)
4. He'll start the test by clicking a button that says "START THE TEST" (or something more exciting, like "Earn some money!"). I'd like a macro to select the first cell (This I can do, believe it or not! :-)) and then, after, say 5 seconds, jump to the second cell, then the third etc up to the last cell (2x13=)
5. Despite the timer, the active cell must be allowed to be changed to the following one (one down) by pressing "Enter" (In other words, if the timer is set at 5 seconds and Jonathan enters the answer in 1, he may then press enter and move to the following cell immediately)
5. He can only enter the answer in the cell while highlighted and I'll have the whole sheet protected once the macro has done its run to the end or once he's answered the final question and pressed "Enter".