I use this activity all the time and modify its difficulty based on the grade level / grammar point
Prep:
-I print out a bunch of these worksheets on the back of scrap paper (sorry SDGs) and then cut them in half. Depending on the class size I like to have around 50-100 half sheets
Rules:
-Hand out one half-sheet to each student
-Each student chooses a character/season/day of the week (whatever you have in the left column)
-Play janken
-Loser has to say 2 true things about their character/season/day of the week using the target grammar point (for example: if you chose Pikachu in the "Can guessing game" you'd say "I can run fast and I can cook".)
-Winner guesses who the loser chose
-If correct, loser gives their paper to the winner. If incorrect, nothing happens and you move on to the next person
-At the end of the time limit, whoever has the most papers is the winner
-When you lose your papers, come to the ALT and ask for another one (I usually call it エリック銀行 and make them ask for a loan / 借金)
Round 2:
-I usually halt at the end of round 1, check who has the most papers, and give them a sticker
-For round 2, before you play janken, you can bet however many papers you want, winner-take-all
-I let them bet with me too since I always have a bunch as the bank
Variations:
-Have the janken-winner ask a question: "What do you want to do?" and the loser answer "I want to OO and OO"
-Have the janken-loser say one thing they do (O) and one thing they don't do (X): "I want to OO. I don't want to OO"
-Have the winner ask "are you OO?" and the loser respond "Yes, I am / No, I'm not"
Let me know if you have any thoughts or questions in the comments. Hope this helps!
I used this for my jhs 1st years, and my 5th and 6th graders and they all really liked it no matter what size class! my es is really small and my jhs is really big but this activity works really well for both!