BotB had a lot of different XHB series in the past years.
This article tries to list at least the most successful and commonly known ones.

'[#[Summer Allgear Series]
The Summer Allgear Series is a notable '[[XHB] series ran by '[l[https://battleofthebits.com/barracks/Profile/hanna/[hanna] during the season of summer. It is considered the XHB counterpart to '[[Summer Chip], in that it mainly uses the '[[allgear (format)[allgear] format for submissions, as opposed to the regular chipist formats used in Summer Chip.

- '[b]SUMMER ALLGEAR SERIES'[/b] (June - September 2020)
'[l[https://battleofthebits.com/arena/XHB/4797/[#1] - '[l[https://battleofthebits.com/arena/XHB/4802/[#2] - '[l[https://battleofthebits.com/arena/XHB/4808/[#3] - '[l[https://battleofthebits.com/arena/XHB/4822/[#4] - '[l[https://battleofthebits.com/arena/XHB/4826/[#5] - '[l[https://battleofthebits.com/arena/XHB/4837/[#6] - '[l[https://battleofthebits.com/arena/XHB/4888/[#7] - '[l[https://battleofthebits.com/arena/XHB/4930/[#8] - '[l[https://battleofthebits.com/arena/XHB/4963/[#9] - '[l[https://battleofthebits.com/arena/XHB/5000/[#10] - '[l[https://battleofthebits.com/arena/XHB/5050/[#11] - '[l[https://battleofthebits.com/arena/XHB/5080/[#12] - '[l[https://battleofthebits.com/arena/XHB/5113/[#13] - '[l[https://battleofthebits.com/arena/XHB/5136/[#14]

'[#[Fallgear]
The sequel to the Summer Allgear Series, hosted by hanna.

- '[b]SAMPLE PACK SERIES'[/b] (October 2020, ongoing)
'[l[https://battleofthebits.com/arena/XHB/5166/[#1]

'[#[Sample Pack Series]
First hosted by hanna, later by '[l[https://battleofthebits.com/barracks/Profile/damifortune/[damifortune], this is a series of Remix OHBs.

- '[b]SAMPLE PACK SERIES'[/b] (August 2020, ongoing)
'[l[https://battleofthebits.com/arena/XHB/4946/[#1] - '[l[https://battleofthebits.com/arena/XHB/4958/[#2] - '[l[https://battleofthebits.com/arena/XHB/4960/[#3] - '[l[https://battleofthebits.com/arena/XHB/4970/[#4] - '[l[https://battleofthebits.com/arena/XHB/4995/[#5] - '[l[https://battleofthebits.com/arena/XHB/4997/[#6] - '[l[https://battleofthebits.com/arena/XHB/5002/[#7] - '[l[https://battleofthebits.com/arena/XHB/5034/[#8] - '[l[https://battleofthebits.com/arena/XHB/5061/[#9] - '[l[https://battleofthebits.com/arena/XHB/5071/[#10] - '[l[https://battleofthebits.com/arena/XHB/5122/[#11] - '[l[https://battleofthebits.com/arena/XHB/5133/[#12] - '[l[https://battleofthebits.com/arena/XHB/5158/[#13]

'[#[The Ultimate Hum]
A 4HB series organized by '[l[https://battleofthebits.com/barracks/Profile/Maximemoring/[Maximemoring] and hosted by '[l[https://battleofthebits.com/barracks/Profile/puke7/[puke7].

- '[b]The Ultimate Hum'[/b] (August 2020, ongoing)
'[l[https://battleofthebits.com/arena/XHB/4948/[#1] - '[l[https://battleofthebits.com/arena/XHB/4985/[#2] - '[l[https://battleofthebits.com/arena/XHB/5026/[#3] - '[l[https://battleofthebits.com/arena/XHB/5069/[#4] - '[l[https://battleofthebits.com/arena/XHB/5098/[#5] - '[l[https://battleofthebits.com/arena/XHB/5128/[#6] - '[l[https://battleofthebits.com/arena/XHB/5150/[#7]

'[#[more series that probably need their own chapter but im too lazy rn to add them seperately]
not sure when a series should get added here. just add them all, i dont care. i think at least a sequel should be hosted to call it a "series", but adding all the 2-ohb-series might be over the top uggg

- vav's lunch break xhb by vav
- Level Music by OPM
- hosting one ohb per day until single-format-major 1 starts by kleeder
- daily famitrack by kleeder
- making music for an imaginary soundchip by kleeder

'[#[See Also]
'[[Battle]
'[[OHB]
'[[2HB]
'[[4HB]
'[[XHB]