How to create this lose money ? Animation ? Blueprint?

Basically:

  1. In your Sonic actor, have a Hit event, check whether the collision is one you want to take damage for.

  2. If it is, subtract the rings from your Sonic actor’s ring count.

  3. Spawn an appropriate number of rings around your Sonic actor via a “SpawnActor” loop (probably best to set an upper limit on how many you spawn, probably).

If you want to make the rings bounce (or not):