diff --git a/README.md b/README.md
index 05586f0..28898ee 100644
--- a/README.md
+++ b/README.md
@@ -47,20 +47,40 @@ With the advent of fujinet (https://fujinet.online/) we are thinking about makin
 
 ## Changes:
 
+###### Build 146
+2022-07-03
+Super heavy rewrite build.
+Not much changed visually since the last build, but really large parts of the code were rewritten, optimized and improved. A fresh swath of buggies certainly introduced, too. 
+- completely new tank falling routine by @Pecusx - over 300 bytes saved, complexity reduced, more just energy deduction when falling.
+- silly angle system rewritten to a proper, primary school angling. BTW - I had to dig into 8th grade trig to make it work. About 200 bytes saved, complexity reduced. Next build will have improved angle speed UI. I will also allow for an easier improvement of tank visuals.
+- Weapon price and quantity balance - this is our honest attempt to make game more fun. We'll accept any critique and improvement proposals.
+- New AI opponent - Tosser! Not much better than Poolshark, but still beats sharks most of the time.
+- AI opponents can purchase defensive weapons what makes playing against AI somewhat more challenging.
+- Improved Laser. It is still not ideal, but better. Still hard to aim :]
+- Few small parachute related bugs fixed
+- Death's Head bug fix
+
+Issues closed:
+- https://github.com/pkali/scorch_src/issues/87 Angles are reasonable now. PROFIT!!!
+
+
 ###### Build 145
 2022-06-26
 Possibly last round of weapon additions!
+
 @Pecusx added 
 - working White Flag -- it is a way to give up while not making opponents richer!
 - Battery - a must for every tank with low energy.
 - Strong Parachute - like a normal parachute, but stronger (it has energy and can work more than once)
 - Nuclear Winter - a quick and efficient solution to global worming, err, warning, WARMING!
+
 @mikerro added new SFX and in-game-tunes.
 - Pressing [S] turns on/off SFX (when aiming). Pressing [M] turns on/off in-game tunes.
+
 Tickets closed:
-- https://github.com/pkali/scorch_src/issues/54 - holding joystick up or down longer speeds up force change. It makes playing with joystick much nicer.
-- https://github.com/pkali/scorch_src/issues/76 - a beginning of visual tweaks by Adam
-- infinite defensive weapons purchase bug fixed, to chagrin of some...
+- https://github.com/pkali/scorch_src/issues/54 - holding a joystick up or down speeds up force change. It makes playing with a joystick much nicer.
+- https://github.com/pkali/scorch_src/issues/76 - a beginning of visual tweaks by @6502adam
+- infinite defensive weapons purchase bug fixed, to the chagrin of some...
 
 ###### Build 144
 2022-06-19
diff --git a/ai.asm b/ai.asm
index a8e3f72..695f520 100644
--- a/ai.asm
+++ b/ai.asm
@@ -409,7 +409,7 @@ SorryNoPurchase
 	mva #4 tempXroller; number of offensive purchases to perform
 	;ldx TankNr
 @
-	randomize ind_Battery________ ind_Heavy_Roller___
+	randomize ind_Missile________ ind_Heavy_Roller___
 	jsr TryToPurchaseOnePiece
 	dec tempXroller
 	bne @-
diff --git a/lib/macro.hea b/lib/macro.hea
index 6181aa6..4e29ec5 100644
--- a/lib/macro.hea
+++ b/lib/macro.hea
@@ -104,6 +104,9 @@
     .macro randomize
     ;usage: randomize floor ceiling
     ;returns (in A) a random .byte between "floor" and "ceiling"
+    .if :2 < :1
+      .error "floor higher than ceiling"
+    .endif
 ?rand
       lda random
       cmp #:1 ;floor
diff --git a/scorch.asm b/scorch.asm
index 3715f18..4283fed 100644
--- a/scorch.asm
+++ b/scorch.asm
@@ -36,7 +36,7 @@
 ;we decided it must go in 'English' to let other people work on it
 
 .macro build
-	dta d"145" ; number of this build (3 bytes)
+	dta d"146" ; number of this build (3 bytes)
 .endm
 
     icl 'definitions.asm'
@@ -1362,7 +1362,7 @@ MODUL    equ $b000                                 ;address of RMT module
 TheEnd
     .ECHO 'TheEnd: ',TheEnd
     .if TheEnd > PMGraph + $300
-        .error memory conflict
+        .error "memory conflict"
 
     .endif
 ;----------------------------------------------
diff --git a/scorch.xex b/scorch.xex
index 78536c9..3f09126 100644
Binary files a/scorch.xex and b/scorch.xex differ