diff --git a/examples/primes.p8 b/examples/primes.p8
index dc1e8213e..f89672ed3 100644
--- a/examples/primes.p8
+++ b/examples/primes.p8
@@ -4,18 +4,14 @@
 ~ main {
 
     ubyte[256] sieve
-    ubyte candidate_prime = 2
+    ubyte candidate_prime = 2       ; is increased in the loop
 
     sub start() {
-        memset(sieve, 256, false)   ; clear the sieve
+        memset(sieve, 256, false)   ; clear the sieve, to reset starting situation on subsequent runs
 
         ; calculate primes
-
-        ; @todo fix this, it misses some primes....
-
-
         c64scr.print("prime numbers up to 255:\n\n")
-        ubyte amount
+        ubyte amount=0
         while true {
             ubyte prime = find_next_prime()
             if prime==0
@@ -25,13 +21,14 @@
             amount++
         }
         c64.CHROUT('\n')
-        c64scr.print("amount of primes: ")
+        c64scr.print("number of primes (expected 54): ")
         c64scr.print_ub(amount)
         c64.CHROUT('\n')
     }
 
 
     sub find_next_prime() -> ubyte {
+
         while sieve[candidate_prime] {
             candidate_prime++
             if candidate_prime==0
@@ -40,7 +37,7 @@
 
         ; found next one, mark the multiples and return it.
         sieve[candidate_prime] = true
-        uword multiple = candidate_prime**2
+        uword multiple = candidate_prime
         while multiple < len(sieve) {
             sieve[lsb(multiple)] = true
             multiple += candidate_prime
diff --git a/examples/tehtriz.p8 b/examples/tehtriz.p8
index eea1066c7..da3c00d47 100644
--- a/examples/tehtriz.p8
+++ b/examples/tehtriz.p8
@@ -8,7 +8,7 @@
     const ubyte startYpos = boardOffsetY - 2
 
     ubyte lines = 0
-    ubyte score = 0
+    uword score = 0
     ubyte xpos = startXpos
     ubyte ypos = startYpos
     ubyte nextBlock = rnd() % 7
diff --git a/examples/test.p8 b/examples/test.p8
index 0295a2460..d34ba4f73 100644
--- a/examples/test.p8
+++ b/examples/test.p8
@@ -7,7 +7,12 @@
 
     ; @todo see problem in looplabelproblem.p8
 
-    ; @todo fix primes.p8 (it misses some primes)
+    ; @todo add docs for '@zp' tag in variable datatype declarations (including forloop loopvars)
+
+    ;  word ww2;  byte bb;  ww2 = bb * 55.w             ; @todo why is this compiling, but resulting in a byte?
+    ;  uword x = sin8u(bb) as uword + 50     ; @todo fix "cannot assign word to uword"
+    ;  uword ypos=4;  ypos += 5000                ; @todo fix "cannot assign word to uword"
+
 
     sub start() {
 
@@ -21,8 +26,10 @@
         bb2 = bb*55
         ww2 = ww*55
 
-        ww2 = bb * 55.w             ; @todo why is this resulting in a byte?
-        ypos += 5000                ; @todo fix "cannot assign word to uword"
+        ;uword x = sin8u(bb) as uword + 50     ; @todo fix "cannot assign word to uword"
+        ;ypos += 5000                ; @todo fix "cannot assign word to uword"
+
+        ww2 = bb * 55.w             ; @todo why is this compiling, but resulting in a byte?
         c64scr.print_w(ww2)
         c64.CHROUT('\n')
         ww2 = (bb as word)*55