You have 4 corner numbers which you use (you don’t have to use all 4 of them) in conjunction with +, - or * buttons to get to the middle 'target' number. There are three rounds (so three different 'target' numbers) per day.
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Numbobulate
You have 4 corner numbers which you use (you don’t have to use all 4 of them) in conjunction with +, - or * buttons to get to the middle 'target' number. There are three rounds (so three different 'target' numbers) per day. Have a go at numbobulate.com