  $(1,3,6,10,15,21,28,27,27,28)$ is a level $h$-vector! This example answers
negatively the open question as to whether all codimension 3 level $h$-vectors
are unimodal. Moreover, using the same (simple) technique, we are able to
construct level algebras of codimension 3 whose $h$-vectors have exactly $N$ `
` maxima", for any positive integer $N$. These non-unimodal $h$-vectors, in
particular, provide examples of codimension 3 level algebras not enjoying the
Weak Lefschetz Property (WLP). Their existence was also an open problem before.
In the second part of the paper we further investigate this fundamental
property, and show that there even exist codimension 3 level algebras of type 3
without the WLP.
