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Shrink the space. Then there isn't ever a situation where one child is "on the other side of the room". Bring the group into closer proximity of each other and more importantly, you.

Mats are...

^^ This how I am too.

My home is old house so its not open plan but a series of little rooms. We play in one room but we move together as a pack.

The front door is visible from my play room so...

Do you have one large room that the children play in different parts of? Are they spread around different smaller rooms?

I have them play in one room. They normally play as a group. While the...