The direct answer
Chapter 99 counts a life of ordeal, then discovers it is still one short.
The novel does not present 81 equal-sized adventures or 81 monsters. Its ledger breaks some arcs into several tests and includes hardships that have no demon at all: Tripitaka’s endangered infancy, recruiting disciples, illness, marriage pressure, imprisonment, and even shedding his mortal body.
The poem in chapter 99 names only 80. Guanyin reads it, invokes the completion of nine times nine, and orders one more hardship. The white turtle’s act at Heaven-Reaching River becomes the missing 81st.
The complete ledger
Nine groups of nine, with the original Chinese labels preserved.
Trials 1–9
- 01Golden Cicada is demoted金蝉遭贬
- 02Nearly killed at birth出胎几杀
- 03Cast into the river at one month old满月抛江
- 04Finding his kin and avenging the wrong寻亲报冤
- 05Meeting a tiger outside the city出城逢虎
- 06The attendant is lost and the monk falls into a pit折从落坑
- 07The ordeal at Double-Fork Ridge双叉岭上
- 08The ordeal at Two-Worlds Mountain两界山头
- 09Replacing the horse at the steep ravine陡涧换马
Trials 10–18
- 10The night fire夜被火烧
- 11Losing the cassock失却袈裟
- 12Recruiting Zhu Bajie收降八戒
- 13Blocked by the Yellow Wind monster黄风怪阻
- 14Seeking help from Lingji请求灵吉
- 15Unable to cross the Flowing Sands流沙难渡
- 16Recruiting Sha Wujing收得沙僧
- 17The Four Sages appear in disguise四圣显化
- 18The ordeal at Five Villages Abbey五庄观中
Trials 19–27
- 19Struggling to revive the ginseng tree难活人参
- 20Banishment of the Mind Monkey贬退心猿
- 21Separated in Black Pine Forest黑松林失散
- 22Delivering the letter in Baoxiang Kingdom宝象国捎书
- 23Transformed into a tiger in the throne hall金銮殿变虎
- 24Meeting demons at Level-Top Mountain平顶山逢魔
- 25Suspended in Lotus Cave莲花洞高悬
- 26Rescuing the king of Wuji乌鸡国救主
- 27Transformed by the demon被魔化身
Trials 28–36
- 28Meeting the monster at Mount Hao号山逢怪
- 29The holy monk is swept away风摄圣僧
- 30The Mind Monkey is harmed心猿遭害
- 31Inviting a sage to subdue the demon请圣降妖
- 32Sunk in the Black River黑河沉没
- 33Moving the carts in Chechi Kingdom搬运车迟
- 34The great contest of victory and defeat大赌输赢
- 35Expelling the Daoists and restoring the monks祛道兴僧
- 36The road blocked by great waters路逢大水
Trials 37–45
- 37Falling into the Heaven-Reaching River身落天河
- 38The fish basket appears鱼篮现身
- 39Meeting the monster at Mount Dou兜山遇怪
- 40All the gods of heaven fail to subdue it普天神难伏
- 41Asking the Buddha for the creature’s origin问佛根源
- 42Poisoned after drinking the water吃水遭毒
- 43Pressed into marriage in Western Liang西梁国留婚
- 44Suffering in Pipa Cave琵琶洞受苦
- 45The Mind Monkey is banished again再贬心猿
Trials 46–54
- 46Unable to distinguish the macaque难辨猕猴
- 47The road blocked by Flaming Mountain路阻火焰山
- 48Seeking the Plantain Fan求取芭蕉扇
- 49Binding the Demon King收缚魔王
- 50Sweeping the pagoda in Jisai Kingdom赛城扫塔
- 51Recovering the treasure and saving the monks取宝救僧
- 52Composing verse at Bramble Ridge棘林吟咏
- 53The disaster at Little Thunderclap小雷音遇难
- 54The celestial gods are trapped诸天神遭困
Trials 55–63
- 55Blocked by the filth of Persimmon Alley稀柿衕秽阻
- 56Practising medicine in Zhuzi Kingdom朱紫国行医
- 57Healing the ailing king拯救疲癃
- 58Subduing the demon and retrieving the queen降妖取后
- 59Confounded by the seven passions七情迷没
- 60Injured by the Many-Eyed demon多目遭伤
- 61The road blocked at Lion-Camel路阻狮驼
- 62The three monsters reveal their forms怪分三色
- 63Disaster inside the city城里遇灾
Trials 64–72
- 64Asking the Buddha to collect the demons请佛收魔
- 65Saving the children of Bhiksu Kingdom比丘救子
- 66Distinguishing truth from deception辨认真邪
- 67Rescuing the creature in the pine forest松林救怪
- 68Falling ill in the monks’ quarters僧房卧病
- 69Trapped in Bottomless Cave无底洞遭困
- 70The ordeal in the Dharma-Destroying Kingdom灭法国难行
- 71Meeting the demon at Hidden-Mist Mountain隐雾山遇魔
- 72Seeking rain for Fengxian Prefecture凤仙郡求雨
Trials 73–81
- 73The weapons are stolen失落兵器
- 74The celebration of the recovered rake会庆钉钯
- 75The ordeal at Bamboo-Joint Mountain竹节山遭难
- 76Suffering in Xuanying Cave玄英洞受苦
- 77Pursuing and capturing the rhinoceros kings赶捉犀牛
- 78The marriage proposal in Tianzhu天竺招婚
- 79Imprisoned in Tongtai Prefecture铜台府监禁
- 80Shedding the mortal body at Cloud-Crossing Ferry凌云渡脱胎
- 81Cast into Heaven-Reaching River (editorial label)通天河落水(说明性标题)
How number 81 is made
The final trial is not waiting on the road. It is ordered after the journey appears complete.
The ledger ends at liberation
Number 80 is shedding the mortal body at Cloud-Crossing Ferry. By ordinary narrative logic, the pilgrims have reached the Buddha, received the scriptures, and finished.
Form requires one more ordeal
Guanyin does not reinterpret the existing 80. She orders the guardians to create one more, making the sacred arithmetic visible inside the plot.
A forgotten promise completes the count
Tripitaka admits he forgot to ask the Buddha about the turtle’s future. The turtle throws everyone into the river; the scriptures are soaked and partly damaged. Completion arrives through an unresolved obligation.
Frequently asked questions
Are the 81 tribulations 81 demon battles?
No. Chapter 99 counts events from Tripitaka’s previous-life demotion and endangered childhood alongside recruitment, illness, imprisonment, temptation, requests for help, and monster encounters. One story arc can also produce several numbered trials.
Why does the written list stop at number 80?
Guanyin reads the ledger and notices that one trial is missing. The pilgrims are dropped at Heaven-Reaching River, where the white turtle throws them and the scriptures into the water after Tripitaka admits forgetting a promise. That event completes number 81.
Why exactly 81?
The chapter explicitly invokes nine times nine returning to completion. Eighty-one is therefore a number of fulfilled religious ordeal, and the narrative deliberately creates a final hardship to complete it.
Are the 81 tribulations the same as 81 chapters?
No. The novel has 100 chapters. A single arc can be counted as multiple trials, while a trial can span chapters. The ledger in chapter 99 is a retrospective spiritual accounting, not an alternate table of contents.
Primary-text evidence
The count, the missing trial, and the river incident all appear in chapter 99.
The first 80 labels follow the public Chinese text. Number 81 uses an editorial label because the chapter narrates the event after the numbered poem instead of adding one more named line to the ledger.
- Chapter 99 · The ledger of 80 trials and the final river ordeal
- Chapter 49 · The turtle’s original request
- 25 major demon encounters · YaoBound
Published and source-checked: July 2026.
From the number to YaoBound
YaoBound borrows the pressure of a completed count—not the fiction that every hardship is one monster.
The game’s hundred-floor Demon-Subduing Tower and post-pilgrimage world are original systems. This guide keeps the classic’s 81-trial ledger separate, so adaptation can echo the number without rewriting what the source actually counts.