I did this activity in an IELTS class this morning as a fun way to practise listening part 1, where you have to write information down including numbers and letters. These could be product codes, reference numbers and other combinations of numbers and letters.
You could also use it with lower level students to practise the alphabet or vocabulary you’ve studied recently.
Dictate a place name, interspersed with letters and numbers. This was my example (be careful with ‘o’ and zero):
Students should write it down as just a series of letters and numbers. Tell them it’s a place which they have to find by underlining the letters. The answer here is ‘Wolverhampton’, the town where I grew up.
They then think of a place name and add some numbers to it to dictate to a partner. They could also choose some vocabulary from a recent class, names of people, or reverse it by having a date with letters interspersed in it.