games to develop being a good loser/being pleased for others

[BumpPower]

I teach an SEN class on p levels. They are lovely but can display very poor and even aggressive behaviour when others win an award/certificate etc. So I need some idea for circle games and things to promote being pleased for others etc.....
any good ideas?

I only work with SEN at secondary so maybe not relevant, but I occasionally pick a 'secret student'
I write the name on a post-it, so they know there is no cheating.
If that person does something - anything!!! - good in the lesson, the whole class gets a treat.
No-one knows who it is. Behaviour is brilliant after the first session when they understand how it works).
That student WILL have done something good ( I will have engineered it )
At the end of the lesson, I reveal the name , say what they did, and the class gets the treat.
Class is delighted with that student for the thing they did ( and the class will then repeat that behaviour)
They clamour for this, so I only do it irregularly, not every lesson, but it works.
This is one of those things that works best with SEN as mainstream kids can be a bit 'meh'.

btw this was something I worked out when my own DC were small because we often had the thing that if I praised one child the others thought they were being 'unpraised' and then there was a clamour...
Works particularly well when delayed at airports