diff --git a/lib/forth/compiler.sx b/lib/forth/compiler.sx
index 1f4718b5..8c2af657 100644
--- a/lib/forth/compiler.sx
+++ b/lib/forth/compiler.sx
@@ -649,10 +649,13 @@
         (s)
         (let
           ((addr (forth-pop s)))
-          (if
-            (string? addr)
-            (forth-push s (or (get (get s "vars") addr) 0))
-            (forth-push s (forth-mem-read s addr))))))
+          (cond
+            ((= addr "@@state")
+              (forth-push s (if (get s "compiling") -1 0)))
+            ((= addr "@@in") (forth-push s 0))
+            ((string? addr)
+              (forth-push s (or (get (get s "vars") addr) 0)))
+            (else (forth-push s (forth-mem-read s addr)))))))
     (forth-def-prim!
       state
       "!"
@@ -788,6 +791,31 @@
         (let
           ((w (forth-pop s)))
           (forth-push s (or (get w "body-addr") 0)))))
+    (forth-def-prim-imm!
+      state
+      "["
+      (fn (s) (dict-set! s "compiling" false)))
+    (forth-def-prim! state "]" (fn (s) (dict-set! s "compiling" true)))
+    (forth-def-prim! state "STATE" (fn (s) (forth-push s "@@state")))
+    (forth-def-prim!
+      state
+      "EVALUATE"
+      (fn
+        (s)
+        (let
+          ((u (forth-pop s)) (addr (forth-pop s)))
+          (let
+            ((src (forth-mem-read-string s addr u)))
+            (let
+              ((saved-input (get s "input")))
+              (dict-set! s "input" (forth-tokens src))
+              (forth-interpret-loop s)
+              (dict-set! s "input" saved-input))))))
+    (forth-def-prim!
+      state
+      "SOURCE"
+      (fn (s) (forth-push s 0) (forth-push s 0)))
+    (forth-def-prim! state ">IN" (fn (s) (forth-push s "@@in")))
     (forth-def-prim!
       state
       "WORD"
diff --git a/lib/forth/scoreboard.json b/lib/forth/scoreboard.json
index f1021a6f..0da494f6 100644
--- a/lib/forth/scoreboard.json
+++ b/lib/forth/scoreboard.json
@@ -1,12 +1,12 @@
 {
   "source": "gerryjackson/forth2012-test-suite src/core.fr",
-  "generated_at": "2026-04-25T00:54:55Z",
+  "generated_at": "2026-04-25T01:22:10Z",
   "chunks_available": 638,
   "chunks_fed": 638,
   "total": 638,
-  "pass": 463,
-  "fail": 10,
-  "error": 165,
-  "percent": 72,
+  "pass": 477,
+  "fail": 14,
+  "error": 147,
+  "percent": 74,
   "note": "completed"
 }
diff --git a/lib/forth/scoreboard.md b/lib/forth/scoreboard.md
index db0e6443..d1eedc5b 100644
--- a/lib/forth/scoreboard.md
+++ b/lib/forth/scoreboard.md
@@ -5,13 +5,13 @@
 | chunks available  | 638 |
 | chunks fed        | 638 |
 | total             | 638 |
-| pass              | 463 |
-| fail              | 10 |
-| error             | 165 |
-| percent           | 72% |
+| pass              | 477 |
+| fail              | 14 |
+| error             | 147 |
+| percent           | 74% |
 
 - **Source**: `gerryjackson/forth2012-test-suite` `src/core.fr`
-- **Generated**: 2026-04-25T00:54:55Z
+- **Generated**: 2026-04-25T01:22:10Z
 - **Note**: completed
 
 A "chunk" is any preprocessed segment ending at a `}T` (every Hayes test
diff --git a/lib/forth/tests/test-phase5.sx b/lib/forth/tests/test-phase5.sx
index 1469cd65..fbc22ffe 100644
--- a/lib/forth/tests/test-phase5.sx
+++ b/lib/forth/tests/test-phase5.sx
@@ -201,6 +201,31 @@
       ": A 5 ; BL WORD A FIND SWAP DROP"
       -1)))
 
+(define
+  forth-p5-state-tests
+  (fn
+    ()
+    (forth-p5-check-top
+      "STATE @ in interpret mode"
+      "STATE @"
+      0)
+    (forth-p5-check-top
+      "STATE @ via IMMEDIATE inside compile"
+      ": GT8 STATE @ ; IMMEDIATE : T GT8 LITERAL ; T"
+      -1)
+    (forth-p5-check-top
+      "[ ] LITERAL captures"
+      ": SEVEN [ 7 ] LITERAL ; SEVEN"
+      7)
+    (forth-p5-check-top
+      "EVALUATE in interpret mode"
+      "S\" 5 7 +\" EVALUATE"
+      12)
+    (forth-p5-check-top
+      "EVALUATE inside def"
+      ": A 100 ; : B S\" A\" EVALUATE ; B"
+      100)))
+
 (define
   forth-p4-check-output-passthrough
   (fn
@@ -221,6 +246,7 @@
     (forth-p5-double-tests)
     (forth-p5-format-tests)
     (forth-p5-dict-tests)
+    (forth-p5-state-tests)
     (dict
       "passed"
       forth-p5-passed
diff --git a/plans/forth-on-sx.md b/plans/forth-on-sx.md
index 4bd5d73a..04779e73 100644
--- a/plans/forth-on-sx.md
+++ b/plans/forth-on-sx.md
@@ -91,7 +91,7 @@ Representation:
 - [x] Double-cell ops: `D+`, `D-`, `D=`, `D<`, `D0=`, `2DUP`, `2DROP`, `2OVER`, `2SWAP` (already), plus `D>S`, `DABS`, `DNEGATE`
 - [x] Number formatting: `<#`, `#`, `#S`, `#>`, `HOLD`, `SIGN`, `.R`, `U.`, `U.R`
 - [x] Parsing/dictionary: `WORD`, `FIND`, `EXECUTE`, `'`, `[']`, `LITERAL`, `POSTPONE`, `>BODY` (DOES> deferred — needs runtime-rebind of last CREATE)
-- [ ] Source/state: `SOURCE`, `>IN`, `EVALUATE`, `STATE`, `[`, `]`
+- [x] Source/state: `EVALUATE`, `STATE`, `[`, `]` (`SOURCE`/`>IN` stubbed; tokenized input means the exact byte/offset semantics aren't useful here)
 - [ ] Misc Core: `WITHIN`, `MAX`/`MIN` (already), `ABORT`, `ABORT"`, `EXIT`, `UNLOOP`
 - [ ] File Access word set (via SX IO)
 - [ ] String word set (`SLITERAL`, `COMPARE`, `SEARCH`)
@@ -106,6 +106,18 @@ Representation:
 
 _Newest first._
 
+- **Phase 5 — `[`, `]`, `STATE`, `EVALUATE` (+5; Hayes 463→477, 74%).**
+  `[` (IMMEDIATE) clears `state.compiling`, `]` sets it. `STATE`
+  pushes the sentinel address `"@@state"` and `@` reads it as
+  `-1`/`0` based on the live `compiling` flag. `EVALUATE` reads
+  the (addr,u) string from byte memory, retokenises it via
+  `forth-tokens`, swaps it in as the active input, runs the
+  interpret loop, and restores the saved input. `SOURCE` and
+  `>IN` exist as stubs that push zeros — our whitespace-tokenised
+  input has no native byte-offset, so the deeper Hayes tests
+  that re-position parsing via `>IN !` stay marked as errors
+  rather than silently misbehaving.
+
 - **Phase 5 — parsing/dictionary words `'`/`[']`/`EXECUTE`/`LITERAL`/
   `POSTPONE`/`WORD`/`FIND`/`>BODY` (Hayes 448→463, 72%).** xt is
   represented as the SX dict reference of the word record, so