> My 9-year old got completely hooked into Perl

Firts I should say: lucky you and him :)

> Now it would be desirable if he could go into graphics and user interfaces

In this situation for GUI I would opt for Prima: I never used it it but I have look at it several times with a growing interest. It is modern and under active developping but a mature project.

Tk is old and has many quirks but still works well: can I prodly point you to my Tartaglia-s-triangle, picwoodpecker, Stone-Jam and Discipulus-15-puzzle?

Stone-Jam is a simple game and maybe my code ( the core is under 200 lines ) is not that bad to understand.

For graphics I used GD in the above picwoodpeaker and in tk-jepg-custom-rotator

GD is not that easy to learn ad use but he can start under your guidance.

My best wishes to your son (..and you)!

L*

PS I have also a fun project where graphic is rendered in terminal: the demo of the project is usable but the overall design is flawed and I have no more will to correct it: Game-Term

git clone  https://github.com/LorenzoTa/Game-Term
cd Game-Term
perl -I ./lib ./demo/00-start.pl
[download]