Multiple Arguments with Views I created a views page displaying "full posts" of any content type.

Next I gave the page URL to be "test/%"

Next I added a contextual filter for Nid


Check "Specify validation criteria" below
"validator" set to content
and "Filter value format" i set to "node IDs separated by , or +"


Now in my preview I put "1+2+3" and I only get node 1. Node 2 and 3 dont show up.

site.com/test/1+2+3 also only gets node 1

How can I get multiple nodes on 1 page?
Did you check the 'Allow multiple values' checkbox in the 'More' section of the contextual filter setup?  The 'More' section is collapsed by default, so it's easy to miss...

You have to check that box: