My students loved this activity during the last week of school and we all hope yours do too.
First, run off the direction/worksheet and pass them out to your students. Have student print their name on the sheet. Have each student think of a word from this year's lessons. Have them write a letter from that word IN PENCIL in the center of the page. Now have them pass the sheet on to the next student in the order you/they chose. Now have that student put the next letter into that 'word' and pass the sheet on to the next student.
That student then puts in another letter (without changing the order of the letters already written down) then they pass the paper on and on and on until a word is completed. Then the next student places a letter in a 'crossword' fashion and passes the sheet on again.
This process continues on until FOUR complete words are made. At that point, the student holding the sheet, counts the total number of letters used, signs the bottom of the sheet with the number and then hands it back to the original owner. The original owner then writes ONE and ONE HALF (1 1/2) of the points next to his/her name and turns the sheet in. This encourages the student to start with the idea of a good 'word'.
If there is enough time in the class period, he/she then starts a new sheet and the process begins over. The game goes on and on for however much time as you decide. Extra credit is always given to the winner(s) based on points earned. Students are always trying to add "S", "EX", "ED", "ER", etc. so that THEY can earn the points.
Having 20 to 30 sheets moving around the room is crazy but it has always been fun, exciting, noisy, and a great activity each year.