Since Joyce described the 12 central episodes as Bloom's "Odyssey" in which he confronts and masters 12 life-challenges, we might look for ways to echo these in classic videogame fashion.
Ideally the 'skills' we have to discover should represent real human virtues, not just stunts.
4 escaping kitchen duties?
5 avoiding drugs, advancing secret affair
6 facing humiliation and death in foreign land?
7 language skills? word puzzles?
8 consumption in moderation (being eaten?)
9 drunk stephen struggles to assemble pieces of elaborate argument
10 shifting paths/ points-of-view = empathic versatility?
11 music as an illusion/ drug? mastering music basics?
12 nationalism as ego
13 flirtation/ seduction: what charms vs what alienates
14 sex vs pregnancy? masturbation, condoms
15 lust and guilt