As is said in VIM’s website:

VIM is an advanced text editor that seeks to provide the power of the de-facto Unix editor ‘Vi’, with a more complete feature set. (…)

VIM Adventures is an interactive way to learn how to use VIM. It’s a web game in which you have to use VIM commands to pass the levels.
If you want to learn how to use VIM, i recommend you to start by playing a game

Links:
[0] http://www.vim.org
[1] http://vim-adventures.com

All you’ll need is the package vim-full, só, in Debian-like systems, you’ll need to execute:

Then, you’ll have to execute:

And you have it working!
NOTE: Depending on the version of your VIM, the path to less.vim might be different.

You can make this command simpler by creating an alias and adding it to your .bashrc file:

Now the system will need to re-read your .bashrc file, so the changes may be applied:

And after this you can test vless:

[0] http://ubuntu-tutorials.com
[1] http://ubuntu-tutorials.com/2008/07/14/use-vim-as-a-syntax-highlighting-pager/

:wq