Strange as it may seem (to me, anyway) to do a version 3 release after version 4 (out of order releases hurt my brain!), here it is: Simon version 3.6.2.
This is a bug-fix update of version 3, to fix some compatibility issues with version 4. It also retrofits the password feature from version 4, at the request of a volume purchase customer who paid extra for that... yes, sometimes I can be bribed. ;)
And yes, this version still uses the old icon — that makes it easier to distinguish versions 3 & 4.
Here are the changes since 3.6.1 in 3.6.2:
If you're using OS X 10.10 (Yosemite), I recommend that you upgrade to version 4, if you haven't already. It includes heaps of great improvements. But if you're on 10.6 (Snow Leopard) to 10.9 (Mavericks), I recommend that you download Simon 3.6.2 now.