In reply to drolex:
>
> - tag, but if you are hanging above the ground you are safe ("chat perché", what's the name in English?)
Chat perche, is "Shark attack" in English.
Further ideas-
Hang items of clothing on holds and get them to put them on as they traverse - this can be easier i.e. big hats, or harder i.e. mitts.
Hold up hula hoops next to the wall as they climb - they have to go through the hoop. You can get holds with holes which fit foam swimming noodles for this purpose.
Hide jigsaw pieces - they have to find and assemble jigsaw
Simon says/Jacque a dit
Musical statues on the wall