Uploaded March 2022 | Updated September 2026, 3 weeks ago

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Here's a guide to the newest innovation to tower for pre 1.9 speedrunning! This tower is called One Block Tower (OBT), or Simple Jump Tower (SJT), and manipulates endermen pathfinding through the use of one block. This block on the ground can be in several locations, but the specific location I show off in the video is easier to fix stuck endermen with. Credits to Sharpieman20 and Chaos for doing most of the work on this tower! Below, you will find several resources that may help with the tower.

One important thing I forgot to mention is that if you don't see any endermen, what you can do is instantly die by moving towards the side block (after sliding off the ladder above the base). This should also be explained in Chaos' video here: youtube.com/watch?v=1PRzZoSwbSk

Resources/Information:
- The versions this tower works for is 1.7 and below. 1.8 rehauled mob pathfinding, which makes this setup not possible.
- Sharpieman20's original Simple Staircase Tower (SST) reveal; explains the mechanics behind this tower (youtube.com/watch?v=RDQ9P7c2NF8)
- Chaos' original One Block Tower reveal (youtube.com/watch?v=ladJSASmA-Y)
- Anthony89810's Sword Tower tutorial that explains ladder mechanics (youtube.com/watch?v=oheZQsMeL_M)
- Anthony89810's Bed Warp Video (youtube.com/watch?v=5HR8HQEt4jg)
- Tower Exits Side-by-Side Comparison (youtube.com/watch?v=5LUccPbEbV8)
- Lackingtoast's Tower Tutorial (youtube.com/watch?v=hUq-pZThoxI)
- Teddiursa's 19:19 World Record using OBT (youtube.com/watch?v=N2yRNlBzMz0)
- Pixfumy's ledge exit demo (youtube.com/watch?v=cYshUDn3rkQ)
- We use 14 tall tower base because it reduces spider aggro, and endermen tend to teleport closer to the hole since you are farther away from them with the increased height as well; Chaos' CJT v3 video as reference (youtube.com/watch?v=shwa3IHzLDg)
- T_Wagz's Video on Tower Concepts with additional ledge explanation (youtube.com/watch?v=KzxaxeLwMBk)
- Tutorial using Ultimate Base (one of the bases I featured in the video) (twitch.tv/videos/1265060799)

Timestamps:
0:00 Introduction and History of the Tower
3:55 Step-by-Step Build Tutorial
10:27 Quick Build of the Tower
12:51 Why Ladder Heights have to be Specific
14:02 Tower Build Numbers for F3 Users
15:32 General Usage of the Tower
21:50 Adjusting Ledge
26:27 Strategies for Perfect Tower Finishes (11 minutes flat)
32:14 Different Tower Bases Exhibit
40:04 Tower Exit: Pillaring
41:30 Tower Exit: Ledge Exit
43:35 Tower Exit: Respawn Invulnerability
44:46 Tower Exit: Water Bucket (Toast Tower)
45:32 Tower Exit: Elivator
48:09 Tower Exit: Pearl + Pillaring
48:40 Tower Exit: TNT Jump
50:15 Conclusion