I know other plus plus blocks are on here but I could not get them to fit correctly. We have tons of the little ones and wanted more of the larger ones. These are sized to fit the large plus plus ( 50X30X10mm). Just scale them down for the little plus plus (20x12x4mm). These also hurt a lot less when you step on them!!!

My kids have millions of lego's but something is fun with the plus plus - great to keep a pile on your desk.