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    8-level mappings use 2 level-shifting keys: ISO_Level3_Shift and ISO_Level5_Shift. various combinations with of these with Shift (aka level2-shift) give you access to all 8 symbols in the mapping. see the various lv5: options in man xkeyboard-config. you may also be interested in this question and the solution presented: unix.stackexchange.com/questions/302163/… Commented Jun 6, 2018 at 12:27
  • Thanks.. Do you know if it is possible to increase the levels? I mean I only intersted to combination that don't chord a lot (ie. two kestrokes - the nth level modifier + the key)? Commented Jun 11, 2018 at 2:52
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    if you're asking how to add shift-keys for levels 4, 6, 7, and 8, the previous link touches on those. (the answer demonstrates latch rather than shift, but a shift implementation would be similar.) ... if you're asking about a level9 and higher, see this answer: unix.stackexchange.com/a/411887/222377 Commented Jun 14, 2018 at 20:47
  • Thanks. So if I wanted to have only the <levelX>+key combinations (without chording), I should define the level 3, level 5, level 9, level 17, level 33 and so on (level 2ⁿ+1)? Is this even possible? If so (it'll weird though) I probably should put NoSymbol to all unwanted chording combinations? Commented Jun 15, 2018 at 10:23
  • as pointed out in the second link, level9 is not a current possibility without rewriting some code. if you want shift/lock/latch keys for level4, level6, level7, and level8 (so you can reach those levels with one shift/lock/latch instead of 2-3, which i assume is what "without chording" is trying to achieve), the first link is what you want. Commented Jun 15, 2018 at 20:46